<!--
/*
 * Global Stylesheet jQuery Plugin
 * Version: 0.1
 * 
 * Enables CSS modification that uses a 'global' stylesheet, rather than inline CSS.
 *
 * Copyright (c) 2009 Jeremy Shipman (http://www.burnbright.co.nz)
 * 
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 * 
 * INSTRUCTIONS:
 * use in the same way as the jQuery css function. Eg:
 *  $("some selector").globalcss("style","value");
 *
 * use the globalsetylesheet.print() function to return a string of the global stylesheet
 */
(function($) {
    //global singleton class for 
    globalstylesheet = new function globalStylesheet(){
        if(!document.styleSheets){
            alert("document.Stylesheets not found");
            return false;
        }
        
        var sheet = null;
        var setrules = Array(); // rule cache
        
        //set up a dummy noded
        var cssNode = document.createElement('style');
        cssNode.type = 'text/css';
        cssNode.rel = 'stylesheet';
        cssNode.media = 'screen';
        cssNode.title = 'globalStyleSheet';
        document.getElementsByTagName("head")[0].appendChild(cssNode);
        
        //find the newly created stylesheet and store reference
        for(var i = 0; i < document.styleSheets.length; i++){
            if(document.styleSheets[i].title == "globalStyleSheet"){
                sheet = document.styleSheets[i];
            }
        }
        
        //set a CSS rule
        this.setRule = function setRule(selector,ruleText){
            if(setrules[selector] != undefined){
                return setrules[selector];
            }else{
                if(sheet.addRule){ // IE
                    sheet.addRule(selector,ruleText,0);
                }else{
                    sheet.insertRule(selector+'{'+ruleText+'}',0);
                }
                setrules[selector] = this.getRule(selector);
            }
            return setrules[selector];
        }
        
        //get a saved CSS rule
        this.getRule = function getRule(selector){
            if(setrules[selector] != undefined){
                return setrules[selector];
            }else{
                var rules = allRules();
                for(var i = 0; i < rules.length; i++){
                    if(rules[i].selectorText == selector){
                        return rules[i];
                    }
                }
            }
            return false;
        }
        
        //helper function to get all rules
        function allRules(){
            if(sheet.cssRules){ //IE
                return sheet.cssRules;
            }else{
                return sheet.rules;
            }
        }
        
        //print out the stylesheet
        this.print = function print(){
            var styleinfo = "";
            var rules = allRules();
            for(var i = 0; i < rules.length; i++){
                styleinfo+= rules[i].cssText+"\n"
            }
            return styleinfo;
        }
        
        //use jQuery's css selector function to set the style object
        this.css = function css(jquery,key,value){
            rule = this.setRule(jquery.selector,key+":"+value+";");
            jQuery(rule).css(key,value); 
        }
    }
    
    //hook new function into jQuery
    jQuery.fn.extend({
        globalcss : function globalcss(key,value){
            globalstylesheet.css(this,key,value);
        }
    });
})(jQuery); 
//-->