//MooTools, My Object Oriented Javascript Tools. Copyright (c) 2006-2007 Valerio Proietti, <http://mad4milk.net>, MIT Style License.
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if($type(document.styleSheets) == 'collection') {
    var cssRule = new Class({
        //reference some properties and methods from Element directly
        Styles : Element.Styles,
        borderShort: Element.borderShort,
        getMany: Element.getMany,
        setMany: Element.setMany,
        fixStyle: Element.fixStyle,
 
        //constructor
        initialize: function(ref,refParent) {
            this.ref = ref; //because the rules are readOnly in Internet Explorer, we have to work with an ugly reference here
            this.refParent = refParent; //for the remove()-method we need to store the parent as a reference
            this.selectorText = this.ref.selectorText.toLowerCase();
            //some browsers are missing some properties. so we add them here for more compatibility
            if($chk(this.ref.style.cssText)) {
                if(this.ref.style.cssText.match(/^[^\{]*\{/)) { //Firefox, Opera, Safari, Webkit
                    this.ref.style.cssText = this.ref.style.cssText.replace(/^[^\{]*\{/,'');
                    this.ref.style.cssText = this.ref.style.cssText.replace(/\}[^\{]*$/,'');
                };
            } else {
                if($chk(this.ref.style)) this.ref.style.cssText = this.stylesToString();
            };
            this._cssText = this.cssText = this.ref.style.cssText.toLowerCase();
            if(!$chk(this.ref.style) || window.webkit) { //Safari, Webkit, the style is always empty
                if($chk(this.ref.style.cssText)) this.ref.style = this.stylesToObject();
            };
            //a reference to the styles. for direct access
            this.style = this.ref.style;
        },
 
        remove: function() {
            if($chk(this.refParent.cssRules)) { //Firefox, Opera, Safari, Webkit
                for(var i=0;i<this.refParent.cssRules.length;i++) {
                    if(this.refParent.cssRules[i] == this.ref) {
                        this.refParent.deleteRule(i);
                        break;
                    };
                };
            } else { //Internet Explorer
                for(var i=0;i<this.refParent.rules.length;i++) {
                    if(this.refParent.rules[i] == this.ref) {
                        this.refParent.removeRule(i);
                    };
                };
            };
               return null;
        },
 
        enable: function() {
            this.ref.style.cssText = this.cssText = this._cssText;
            return this;
        },
 
        disable: function() {
            //if disable was used several times before enable, we must make sure we do not empty it forever.
            if(this.ref.style.cssText != '') this._cssText = this.ref.style.cssText;
            this.ref.style.cssText = this.cssText = '';
            return this;
        },
 
        setStyle: function(property, value){
            switch(property){
                case 'opacity': return this.setOpacity(parseFloat(value));
                case 'float': property = (window.ie) ? 'styleFloat' : 'cssFloat';
            };
            property = property.camelCase();
            switch($type(value)){
                case 'number': if (!['zIndex', 'zoom'].contains(property)) value += 'px'; break;
                case 'array': value = 'rgb(' + value.join(',') + ')';
            };
            this.ref.style[property] = value;
            this._cssText = this.cssText = this.ref.style.cssText;
            return this;
        },
 
        setStyles: function(source){
            switch($type(source)){
                case 'object': this.setMany(this, 'setStyle', source); break;
                case 'string': this.ref.style.cssText = this._cssText = source;
            };
            return this;
        },
 
        setOpacity: function(opacity){
            if (opacity == 0){
                if (this.ref.style.visibility != "hidden") this.ref.style.visibility = "hidden";
            } else {
                if (this.ref.style.visibility != "visible") this.ref.style.visibility = "visible";
            };
            if (!this.ref.currentStyle || !this.ref.currentStyle.hasLayout) this.ref.style.zoom = 1;
            if (window.ie) this.ref.style.filter = (opacity == 1) ? '' : "alpha(opacity=" + opacity * 100 + ")";
            this.ref.style.opacity = this.ref.$tmp.opacity = opacity;
            this._cssText = this.cssText = this.ref.style.cssText;
            return this;
        },
 
        getStyle: function(property){
            property = property.camelCase();
            var result = this.ref.style[property];
            if (!$chk(result)){
                if (property == 'opacity') return this.ref.$tmp.opacity;
                result = [];
                for (var style in this.Styles){
                    if (property == style){
                        this.Styles[style].each(function(s){
                            var style = this.getStyle(s);
                            result.push(parseInt(style) ? style : '0px');
                        }, this);
                        if (property == 'border'){
                            var every = result.every(function(bit){
                                return (bit == result[0]);
                            });
                            return (every) ? result[0] : false;
                        };
                        return result.join(' ');
                    };
                };
                if (property.contains('border')){
                    if (this.Styles.border.contains(property)){
                        return ['Width', 'Style', 'Color'].map(function(p){
                            return this.getStyle(property + p);
                        }, this).join(' ');
                    } else if (this.borderShort.contains(property)){
                        return ['Top', 'Right', 'Bottom', 'Left'].map(function(p){
                            return this.getStyle('border' + p + property.replace('border', ''));
                        }, this).join(' ');
                    };
                };
                if (document.defaultView) result = document.defaultView.getComputedStyle(this, null).getPropertyValue(property.hyphenate());
                else if (this.currentStyle) result = this.currentStyle[property];
            }
            if (window.ie) result = this.fixStyle(property, result, this);
            if (result && property.test(/color/i) && result.contains('rgb')){
                return result.split('rgb').splice(1,4).map(function(color){
                    return color.rgbToHex();
                }).join(' ');
            };
            return result;
        },
 
        getStyles: function(){
            return this.getMany(this, 'getStyle', arguments);
        },
 
        stylesToString: function(obj) {
            var result = '';
            if(!$chk(obj) || !obj) obj = this.ref.style;
            for(var i in obj) if($chk(obj[i]) && obj[i]) result += i.hyphenate()+':'+obj[i]+';';
            result = result.toLowerCase();
            return result;
        },
 
        stylesToObject: function(styles) {
            var result = {};
            if(!$chk(styles) || !styles) styles = this.ref.style.cssText;
            var temp = styles.split(';');
            for(var i=0;i<temp.length;i++) {
                var temp2 = temp[i].split(':');
                if($chk(temp2[0]) && $chk(temp2[1])) {
                    result[temp2[0].trim().camelCase()] = temp2[1].trim();
                };
            };
            return result;
        }
    });
 
    $extend(document,{
        walkSelectors: function(obj,callback,collector) {
            if(!$chk(obj) || !obj) obj = this.styleSheets;
            if($chk(obj)) {
                for(var i=0;i<obj.length;i++) {
                    var styleSheet=obj[i];
                    var ii=0;
                    var rule=false;
                    do {
                        if($chk(styleSheet.cssRules)) rule = styleSheet.cssRules[ii]; //Firefox, Opera, Safari, Webkit
                        else rule = styleSheet.rules[ii]; //Internet Explorer
                        if(rule) {
                            if( //@import
                                $type(rule.cssText) == 'string' &&
                                rule.cssText.match(/@import/i) &&
                                $type(rule.parentStyleSheet) == 'object'
                            ) {
                                var temp = this.walkSelectors([rule.styleSheet],callback,collector);
                                if($chk(temp) && temp) return temp;
                            } else if( //@media
                                $type(rule.cssText) == 'string' &&
                                rule.cssText.match(/@media/i)
                            ) {
                                var temp = this.walkSelectors([rule],callback,collector);
                                if($chk(temp) && temp) return temp;
                            } else {
                                if(!$chk(rule.selectorText)) { //set selectorText if missing
                                    if(
                                        $chk(rule.style) &&
                                        $chk(rule.style.cssText) &&
                                        rule.style.cssText.match(/^(.*[a-zA-Z]+.*)\{/)
                                    ) {
                                        rule.selectorText = RegExp.$1.trim();
                                    };
                                };
                                if(callback(rule)) {
                                    var temp = new cssRule(rule,styleSheet);
                                    if($type(collector) == 'array') collector.push(temp);
                                    else return temp;
                                };
                            };
                        };
                        ii++;
                    } while(rule);
                    if($chk(styleSheet.imports)) { //Internet Explorer
                        for(var j=0;j<styleSheet.imports.length;j++) {
                            var temp = this.walkSelectors([styleSheet.imports[j]],callback,collector);
                            if($chk(temp) && temp) return temp;
                        };
                    };
                };
            };
            return false;
        },
 
        getStyleBySelector: function(sel,obj) {
            return this.walkSelectors(obj,function(rule) {
                if( //exact match
                    $type(rule.selectorText) == 'string' &&
                    rule.selectorText.toLowerCase() == sel.toLowerCase()
                ) return true;
                else return false;
            });
        },
 
        getStylesBySelectorMatch: function(sel,obj) {
            var collector = [];
            this.walkSelectors(obj,function(rule) {
                if( //contains
                    $type(rule.selectorText) == 'string' &&
                    rule.selectorText.toLowerCase().indexOf(sel.toLowerCase()) != -1
                ) return true;
                else return false;
            },collector);
            return collector;
        },
 
        getStylesBySelectorRegExp: function(sel,obj) {
            var collector = [];
            this.walkSelectors(obj,function(rule) {
                if( //regular expression
                    $type(rule.selectorText) == 'string' &&
                    rule.selectorText.toLowerCase().match(sel)
                ) return true;
                else return false;
            },collector);
            return collector;
        },
 
        createStyle: function(sel,styles) {
            if($type(styles) == 'object') styles = cssRule.prototype.stylesToString(styles);
            if(!this.getStyleBySelector(sel)) {
                //Internet Explorer
                if($chk(document.styleSheets[0].addRule)) document.styleSheets[0].addRule(sel,styles);
                //FF, Opera, Safari, Webkit
                else document.styleSheets[0].insertRule(sel+'{'+styles+'}',document.styleSheets[0].cssRules.length);
                return this.getStyleBySelector(sel);
            };
            return false;
        }
    });
} else { //for browsers that do not support this feature, we always return false
    $extend(document,{
        getStyleBySelector: function() { return false; },
        getStylesBySelectorMatch: function() { return false; },
        getStylesBySelectorRegExp: function() { return false; },
        createStyle: function() { return false; }
    });
};

//shorthands
function $S(sel) { return document.getStyleBySelector(sel); };
function $SM(sel) { return document.getStylesBySelectorMatch(sel); };
function $SR(sel) { return document.getStylesBySelectorRegExp(sel); };