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diff --git a/frontend/gamma/js/Clipperz/YUI/DomQuery.js b/frontend/gamma/js/Clipperz/YUI/DomQuery.js
new file mode 100644
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+++ b/frontend/gamma/js/Clipperz/YUI/DomQuery.js
@@ -0,0 +1,714 @@
+/*
+
+Copyright 2008-2011 Clipperz Srl
+
+This file is part of Clipperz's Javascript Crypto Library.
+Javascript Crypto Library provides web developers with an extensive
+and efficient set of cryptographic functions. The library aims to
+obtain maximum execution speed while preserving modularity and
+reusability.
+For further information about its features and functionalities please
+refer to http://www.clipperz.com
+
+* Javascript Crypto Library is free software: you can redistribute
+  it and/or modify it under the terms of the GNU Affero General Public
+  License as published by the Free Software Foundation, either version
+  3 of the License, or (at your option) any later version.
+
+* Javascript Crypto Library is distributed in the hope that it will
+  be useful, but WITHOUT ANY WARRANTY; without even the implied
+  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Affero General Public License for more details.
+
+* You should have received a copy of the GNU Affero General Public
+  License along with Javascript Crypto Library.  If not, see
+  <http://www.gnu.org/licenses/>.
+
+*/
+
+if (typeof(Clipperz) == 'undefined') { Clipperz = {}; }
+if (typeof(Clipperz.YUI) == 'undefined') { Clipperz.YUI = {}; }
+
+
+/*
+ * yui-ext 0.40
+ * Copyright(c) 2006, Jack Slocum.
+ */
+
+/**
+ * @class Clipperz.YUI.DomQuery
+ * Provides high performance selector/xpath processing by compiling queries into reusable functions.
+ * New pseudo classes and matchers can be plugged. It works on HTML and XML documents (if a content node is passed in).
+ * @singleton
+ */
+Clipperz.YUI.DomQuery = function(){
+    var cache = {}, simpleCache = {}, valueCache = {};
+    var nonSpace = /\S/;
+    var trimRe = /^\s*(.*?)\s*$/;
+    var tplRe = /\{(\d+)\}/g;
+    var modeRe = /^(\s?[\/>]\s?|\s|$)/;
+    var clsRes = {};
+    
+    function child(p, index){
+        var i = 0;
+        var n = p.firstChild;
+        while(n){
+            if(n.nodeType == 1){
+               i++;
+               if(i == index){
+                   return n;
+               }
+            }
+            n = n.nextSibling;
+        }
+        return null;
+    };
+    
+    function next(d){
+        var n = d.nextSibling;
+        while(n && n.nodeType != 1){
+            n = n.nextSibling;
+        }
+        return n;
+    };
+    
+    function prev(d){
+        var n = d.previousSibling;
+        while(n && n.nodeType != 1){
+            n = n.previousSibling;
+        }
+        return n;
+    };
+    
+    function clean(d){
+        var n = d.firstChild, ni = -1;
+             while(n){
+                 var nx = n.nextSibling;
+                 if(n.nodeType == 3 && !nonSpace.test(n.nodeValue)){
+                     d.removeChild(n);
+                 }else{
+                     n.nodeIndex = ++ni;
+                 }
+                 n = nx;
+             }
+             return this;
+         };
+    
+    function byClassName(c, a, v){
+        if(!v){
+            return c;
+        }
+        var re = clsRes[v];
+        if(!re){
+            re = new RegExp('(?:^|\\s)(?:' + v + ')(?:\\s|$)');
+            clsRes[v] = re;
+        }
+        var r = [];
+        for(var i = 0, ci; ci = c[i]; i++){
+            if(re.test(ci.className)){
+                r[r.length] = ci;
+            }
+        }
+        return r;
+    };
+    
+    function convert(c){
+        if(c.slice){
+            return c;
+        }
+        var r = [];
+        for(var i = 0, l = c.length; i < l; i++){
+            r[r.length] = c[i];
+        }
+        return r;
+    };
+    
+    function attrValue(n, attr){
+        if(!n.tagName && typeof n.length != 'undefined'){
+            n = n[0];
+        }
+        if(!n){
+            return null;
+        }
+        if(attr == 'for'){
+            return n.htmlFor;
+        }
+        if(attr == 'class' || attr == 'className'){
+            return n.className;
+        }
+        return n.getAttribute(attr) || n[attr];
+          
+    };
+    
+    function getNodes(ns, mode, tagName){
+        var result = [], cs;
+        if(!ns){
+            return result;
+        }
+        mode = mode ? mode.replace(trimRe, '$1') : '';
+        tagName = tagName || '*';
+        if(ns.tagName || ns == document){
+            ns = [ns];   
+        }
+        if(mode != '/' && mode != '>'){
+            for(var i = 0, ni; ni = ns[i]; i++){
+                cs = ni.getElementsByTagName(tagName);
+                result = concat(result, cs);
+            }
+        }else{
+            for(var i = 0, ni; ni = ns[i]; i++){
+                var cn = ni.getElementsByTagName(tagName);
+                for(var j = 0, cj; cj = cn[j]; j++){
+                    if(cj.parentNode == ni){
+                        result[result.length] = cj;
+                    }
+                }
+            }
+            
+        }
+        return result;
+    };
+    
+    function concat(a, b){
+        if(b.slice){
+            return a.concat(b);
+        }
+        for(var i = 0, l = b.length; i < l; i++){
+            a[a.length] = b[i];
+        }
+        return a;
+    }
+    
+    function byTag(cs, tagName){
+        if(cs.tagName || cs == document){
+            cs = [cs];
+        }
+        if(!tagName){
+            return cs;
+        }
+        var r = []; tagName = tagName.toLowerCase();
+        for(var i = 0, ci; ci = cs[i]; i++){
+            if(ci.nodeType == 1 && ci.tagName.toLowerCase()==tagName){
+                r[r.length] = ci;
+            }
+        }
+        return r; 
+    };
+    
+    function byId(cs, attr, id){
+        if(cs.tagName || cs == document){
+            cs = [cs];
+        }
+        if(!id){
+            return cs;
+        }
+        var r = [];
+        for(var i = 0, l = cs.length; i < l; i++){
+            var ci = cs[i];
+            if(ci && ci.id == id){
+                r[r.length] = ci;
+            }
+        }
+        return r; 
+    };
+    
+    function byAttribute(cs, attr, value, op, custom){
+        var r = [], st = custom=='{';
+        var f = Clipperz.YUI.DomQuery.operators[op];
+        for(var i = 0, l = cs.length; i < l; i++){
+            var a;
+            if(st){
+                a = Clipperz.YUI.DomQuery.getStyle(cs[i], attr);
+            }
+            else if(attr == 'class' || attr == 'className'){
+                a = cs[i].className;
+            }else if(attr == 'for'){
+                a = cs[i].htmlFor;
+            }else{
+                a = cs[i].getAttribute(attr);
+            }
+            if((f && f(a, value)) || (!f && a)){
+                r[r.length] = cs[i];
+            }
+        }
+        return r;
+    };
+    
+    function byPseudo(cs, name, value){
+        return Clipperz.YUI.DomQuery.pseudos[name](cs, value);
+    };
+    
+    // This is for IE MSXML which does not support expandos.
+    // IE runs the same speed using setAttribute, however FF slows way down
+    // and Safari completely fails so they need to continue to use expandos.
+    // Branched at load time for faster execution.
+    var isIE = window.ActiveXObject;
+    var addAttr = isIE ? 
+           function(n, a, v){
+              n.setAttribute(a, v);
+           } : 
+           function(n, a, v){
+              n[a] = v;
+           };
+    var getAttr = isIE ? 
+           function(n, a){
+              return n.getAttribute(a);
+           } : 
+           function(n, a){
+              return n[a];
+           };
+    var clearAttr = isIE ? 
+           function(n, a){
+              n.removeAttribute(a);
+           } : 
+           function(n, a, v){
+              delete n[a];
+           };
+    
+    function nodup(cs){
+        if(!cs.length){
+            return cs;
+        }
+        addAttr(cs[0], '_nodup', true);
+        var r = [cs[0]];
+        for(var i = 1, len = cs.length; i < len; i++){
+            var c = cs[i];
+            if(!getAttr(c, '_nodup')){
+                addAttr(c, '_nodup', true);
+                r[r.length] = c;
+            }
+        }
+        for(var i = 0, len = cs.length; i < len; i++){
+            clearAttr(cs[i], '_nodup');
+        }
+        return r;
+    }
+    
+    function quickDiff(c1, c2){
+        if(!c1.length){
+            return c2;
+        }
+        for(var i = 0, len = c1.length; i < len; i++){
+            addAttr(c1[i], '_qdiff', true);
+        }
+        var r = [];
+        for(var i = 0, len = c2.length; i < len; i++){
+            if(!getAttr(c2[i], '_qdiff')){
+                r[r.length] = c2[i];
+            }
+        }
+        for(var i = 0, len = c1.length; i < len; i++){
+            clearAttr(c1[i], '_qdiff');
+        }
+        return r;
+    }
+    
+    function quickId(ns, mode, root, id){
+        if(ns == root){
+           var d = root.ownerDocument || root;
+           return d.getElementById(id);
+        }
+        ns = getNodes(ns, mode, '*');
+        return byId(ns, null, id);
+    }
+    
+    return {
+        getStyle : function(el, name){
+            return YAHOO.util.Dom.getStyle(el, name);  
+        },
+        /**
+         * Compiles a selector/xpath query into a reusable function. The returned function
+         * takes one parameter "root" (optional), which is the context node from where the query should start. 
+         * @param {String} selector The selector/xpath query
+         * @param {String} type (optional) Either 'select' (the default) or 'simple' for a simple selector match
+         * @return {Function}
+         */
+        compile : function(path, type){
+            // strip leading slashes
+            while(path.substr(0, 1)=='/'){
+                path = path.substr(1);
+            }
+            type = type || 'select';
+            
+            var fn = ['var f = function(root){\n var mode; var n = root || document;\n'];
+            var q = path, mode, lq;
+            var tk = Clipperz.YUI.DomQuery.matchers;
+            var tklen = tk.length;
+            var mm;
+            while(q && lq != q){
+                lq = q;
+                var tm = q.match(/^(#)?([\w-\*]+)/);
+                if(type == 'select'){
+                    if(tm){
+                        if(tm[1] == '#'){
+                            fn[fn.length] = 'n = quickId(n, mode, root, "'+tm[2]+'");';
+                        }else{
+                            fn[fn.length] = 'n = getNodes(n, mode, "'+tm[2]+'");';
+                        }
+                        q = q.replace(tm[0], '');
+                    }else{
+                        fn[fn.length] = 'n = getNodes(n, mode, "*");';
+                    }
+                }else{
+                    if(tm){
+                        if(tm[1] == '#'){
+                            fn[fn.length] = 'n = byId(n, null, "'+tm[2]+'");';
+                        }else{
+                            fn[fn.length] = 'n = byTag(n, "'+tm[2]+'");';
+                        }
+                        q = q.replace(tm[0], '');
+                    }
+                }
+                while(!(mm = q.match(modeRe))){
+                    var matched = false;
+                    for(var j = 0; j < tklen; j++){
+                        var t = tk[j];
+                        var m = q.match(t.re);
+                        if(m){
+                            fn[fn.length] = t.select.replace(tplRe, function(x, i){
+                                                    return m[i];
+                                                });
+                            q = q.replace(m[0], '');
+                            matched = true;
+                            break;
+                        }
+                    }
+                    // prevent infinite loop on bad selector
+                    if(!matched){
+                        throw 'Error parsing selector, parsing failed at "' + q + '"';
+                    }
+                }
+                if(mm[1]){
+                    fn[fn.length] = 'mode="'+mm[1]+'";';
+                    q = q.replace(mm[1], '');
+                }
+            }
+            fn[fn.length] = 'return nodup(n);\n}';
+            eval(fn.join(''));
+            return f;
+        },
+        
+        /**
+         * Selects a group of elements.
+         * @param {String} selector The selector/xpath query
+         * @param {Node} root (optional) The start of the query (defaults to document).
+         * @return {Array}
+         */
+        select : function(path, root, type){
+            if(!root || root == document){
+                root = document;
+            }
+            if(typeof root == 'string'){
+                root = document.getElementById(root);
+            }
+            var paths = path.split(',');
+            var results = [];
+            for(var i = 0, len = paths.length; i < len; i++){
+                var p = paths[i].replace(trimRe, '$1');
+                if(!cache[p]){
+                    cache[p] = Clipperz.YUI.DomQuery.compile(p);
+                    if(!cache[p]){
+                        throw p + ' is not a valid selector';
+                    }
+                }
+                var result = cache[p](root);
+                if(result && result != document){
+                    results = results.concat(result);
+                }
+            }
+            return results;
+        },
+        
+        /**
+         * Selects a single element.
+         * @param {String} selector The selector/xpath query
+         * @param {Node} root (optional) The start of the query (defaults to document).
+         * @return {Element}
+         */
+        selectNode : function(path, root){
+            return Clipperz.YUI.DomQuery.select(path, root)[0];
+        },
+        
+        /**
+         * Selects the value of a node, optionally replacing null with the defaultValue.
+         * @param {String} selector The selector/xpath query
+         * @param {Node} root (optional) The start of the query (defaults to document).
+         * @param {String} defaultValue
+         */
+        selectValue : function(path, root, defaultValue){
+            path = path.replace(trimRe, '$1');
+            if(!valueCache[path]){
+                valueCache[path] = Clipperz.YUI.DomQuery.compile(path, 'simple');
+            }
+            var n = valueCache[path](root);
+            n = n[0] ? n[0] : n;
+            var v = (n && n.firstChild ? n.firstChild.nodeValue : null);
+            return (v === null ? defaultValue : v);
+        },
+        
+        /**
+         * Selects the value of a node, parsing integers and floats.
+         * @param {String} selector The selector/xpath query
+         * @param {Node} root (optional) The start of the query (defaults to document).
+         * @param {Number} defaultValue
+         * @return {Number}
+         */
+        selectNumber : function(path, root, defaultValue){
+            var v = Clipperz.YUI.DomQuery.selectValue(path, root, defaultValue || 0);
+            return parseFloat(v);
+        },
+        
+        /**
+         * Returns true if the passed element(s) match the passed simple selector (e.g. div.some-class or span:first-child)
+         * @param {String/HTMLElement/Array} el An element id, element or array of elements
+         * @param {String} selector The simple selector to test
+         * @return {Boolean}
+         */
+        is : function(el, ss){
+            if(typeof el == 'string'){
+                el = document.getElementById(el);
+            }
+            var isArray = (el instanceof Array);
+            var result = Clipperz.YUI.DomQuery.filter(isArray ? el : [el], ss);
+            return isArray ? (result.length == el.length) : (result.length > 0);
+        },
+        
+        /**
+         * Filters an array of elements to only include matches of a simple selector (e.g. div.some-class or span:first-child)
+         * @param {Array} el An array of elements to filter
+         * @param {String} selector The simple selector to test
+         * @param {Boolean} nonMatches If true, it returns the elements that DON'T match 
+         * the selector instead of the ones that match
+         * @return {Array}
+         */
+        filter : function(els, ss, nonMatches){
+            ss = ss.replace(trimRe, '$1');
+            if(!simpleCache[ss]){
+                simpleCache[ss] = Clipperz.YUI.DomQuery.compile(ss, 'simple');
+            }
+            var result = simpleCache[ss](els);
+            return nonMatches ? quickDiff(result, els) : result;
+        },
+        
+        /**
+         * Collection of matching regular expressions and code snippets. 
+         */
+        matchers : [{
+                re: /^\.([\w-]+)/,
+                select: 'n = byClassName(n, null, "{1}");'
+            }, {
+                re: /^\:([\w-]+)(?:\(((?:[^\s>\/]*|.*?))\))?/,
+                select: 'n = byPseudo(n, "{1}", "{2}");'
+            },{
+                re: /^(?:([\[\{])(?:@)?([\w-]+)\s?(?:(=|.=)\s?['"]?(.*?)["']?)?[\]\}])/,
+                select: 'n = byAttribute(n, "{2}", "{4}", "{3}", "{1}");'
+            }, {
+                re: /^#([\w-]+)/,
+                select: 'n = byId(n, null, "{1}");'
+            },{
+                re: /^@([\w-]+)/,
+                select: 'return {firstChild:{nodeValue:attrValue(n, "{1}")}};'
+            }
+        ],
+        
+        /**
+         * Collection of operator comparison functions. The default operators are =, !=, ^=, $=, *= and %=.
+         * New operators can be added as long as the match the format <i>c</i>= where <i>c<i> is any character other than space, &gt; &lt;.
+         */
+        operators : {
+            '=' : function(a, v){
+                return a == v;
+            },
+            '!=' : function(a, v){
+                return a != v;
+            },
+            '^=' : function(a, v){
+                return a && a.substr(0, v.length) == v;
+            },
+            '$=' : function(a, v){
+                return a && a.substr(a.length-v.length) == v;
+            },
+            '*=' : function(a, v){
+                return a && a.indexOf(v) !== -1;
+            },
+            '%=' : function(a, v){
+                return (a % v) == 0;
+            }
+        },
+        
+        /**
+         * Collection of "pseudo class" processors. Each processor is passed the current nodeset (array)
+         * and the argument (if any) supplied in the selector.
+         */
+        pseudos : {
+            'first-child' : function(c){
+                var r = [];
+                for(var i = 0, l = c.length; i < l; i++){
+                    var ci = c[i];
+                    if(!prev(ci)){
+                        r[r.length] = ci;
+                    }
+                }
+                return r;
+            },
+            
+            'last-child' : function(c){
+                var r = [];
+                for(var i = 0, l = c.length; i < l; i++){
+                    var ci = c[i];
+                    if(!next(ci)){
+                        r[r.length] = ci;
+                    }
+                }
+                return r;
+            },
+            
+            'nth-child' : function(c, a){
+                var r = [];
+                if(a != 'odd' && a != 'even'){
+                    for(var i = 0, ci; ci = c[i]; i++){
+                        var m = child(ci.parentNode, a);
+                        if(m == ci){
+                            r[r.length] = m;
+                        }
+                    }
+                    return r;
+                }
+                var p;
+                // first let's clean up the parent nodes
+                for(var i = 0, l = c.length; i < l; i++){
+                    var cp = c[i].parentNode;
+                    if(cp != p){
+                        clean(cp);
+                        p = cp;
+                    }
+                }
+                // then lets see if we match
+                for(var i = 0, l = c.length; i < l; i++){
+                    var ci = c[i], m = false;
+                    if(a == 'odd'){
+                        m = ((ci.nodeIndex+1) % 2 == 1);
+                    }else if(a == 'even'){
+                        m = ((ci.nodeIndex+1) % 2 == 0);
+                    }
+                    if(m){
+                        r[r.length] = ci;
+                    }
+                }
+                return r;
+            },
+            
+            'only-child' : function(c){
+                var r = [];
+                for(var i = 0, l = c.length; i < l; i++){
+                    var ci = c[i];
+                    if(!prev(ci) && !next(ci)){
+                        r[r.length] = ci;
+                    }
+                }
+                return r;
+            },
+            
+            'empty' : function(c){
+                var r = [];
+                for(var i = 0, l = c.length; i < l; i++){
+                    var ci = c[i];
+                    if(!ci.firstChild){
+                        r[r.length] = ci;
+                    }
+                }
+                return r;
+            },
+            
+            'contains' : function(c, v){
+                var r = [];
+                for(var i = 0, l = c.length; i < l; i++){
+                    var ci = c[i];
+                    if(ci.innerHTML.indexOf(v) !== -1){
+                        r[r.length] = ci;
+                    }
+                }
+                return r;
+            },
+            
+            'checked' : function(c){
+                var r = [];
+                for(var i = 0, l = c.length; i < l; i++){
+                    if(c[i].checked == 'checked'){
+                        r[r.length] = c[i];
+                    }
+                }
+                return r;
+            },
+            
+            'not' : function(c, ss){
+                return Clipperz.YUI.DomQuery.filter(c, ss, true);
+            },
+            
+            'odd' : function(c){
+                return this['nth-child'](c, 'odd');
+            },
+            
+            'even' : function(c){
+                return this['nth-child'](c, 'even');
+            },
+            
+            'nth' : function(c, a){
+                return c[a-1];
+            },
+            
+            'first' : function(c){
+                return c[0];
+            },
+            
+            'last' : function(c){
+                return c[c.length-1];
+            },
+            
+            'has' : function(c, ss){
+                var s = Clipperz.YUI.DomQuery.select;
+                var r = [];
+                for(var i = 0, ci; ci = c[i]; i++){
+                    if(s(ss, ci).length > 0){
+                        r[r.length] = ci;
+                    }
+                }
+                return r;
+            },
+            
+            'next' : function(c, ss){
+                var is = Clipperz.YUI.DomQuery.is;
+                var r = [];
+                for(var i = 0, ci; ci = c[i]; i++){
+                    var n = next(ci);
+                    if(n && is(n, ss)){
+                        r[r.length] = ci;
+                    }
+                }
+                return r;
+            },
+            
+            'prev' : function(c, ss){
+                var is = Clipperz.YUI.DomQuery.is;
+                var r = [];
+                for(var i = 0, ci; ci = c[i]; i++){
+                    var n = prev(ci);
+                    if(n && is(n, ss)){
+                        r[r.length] = ci;
+                    }
+                }
+                return r;
+            }
+        }
+    };
+}();
+
+/**
+ * Selects an array of DOM nodes by CSS/XPath selector. Shorthand of {@link Clipperz.YUI.DomQuery#select}
+ * @param {String} path The selector/xpath query
+ * @param {Node} root (optional) The start of the query (defaults to document).
+ * @return {Array}
+ * @member Ext
+ * @method query
+ */
+Clipperz.YUI.query = Clipperz.YUI.DomQuery.select;