/**
 * --------------------------------------------------------------------
 * jQuery-Plugin "preloadCssImages"
 * by Scott Jehl, scott@filamentgroup.com
 * http://www.filamentgroup.com
 * reference article: http://www.filamentgroup.com/lab/automated_image_preloading/
 * demo page: http://www.filamentgroup.com/examples/preloadImages/
 * 
 * Copyright (c) 2008 Filament Group, Inc
 * Dual licensed under the MIT (filamentgroup.com/examples/mit-license.txt) and GPL (filamentgroup.com/examples/gpl-license.txt) licenses.
 *
 * Version: 1.0, 31.05.2007
 * Changelog:
 * 	02.20.2008 initial Version 1.0
 * --------------------------------------------------------------------
 */
 
$.preloadCssImages = function(settings){
	//overrideable defaults
	settings = jQuery.extend({
		 imgDir: 'images',
         styleName: false
	}, settings);

	//dump all the css rules into one string
	var sheets = document.styleSheets;
	var cssPile = '';
	for(var i = 0; i<sheets.length; i++){
//        console.log(document.styleSheets[i]);
//        console.log(document.styleSheets[i].href);
        
        if (document.styleSheets[i].styleName != false && document.styleSheets[i].href.indexOf(settings.styleName) != -1){
		    if(!$.browser.msie){
                
			    var thisSheetRules = document.styleSheets[i].cssRules;
			    for(var j = 0; j<thisSheetRules.length; j++){
				    cssPile+= thisSheetRules[j].cssText;
//				    console.log(thisSheetRules[j].cssText);
			    }
		    }
		    else {
			    cssPile+= document.styleSheets[i].cssText;
		    }
        }
	}
	//parse string for image urls and load them into the DOM
	var allImgs = [];//new array for all the image urls  
	var imgUrls = cssPile.match(/[^\/]+\.(gif|jpg|jpeg|png)/g);//reg ex to get a string of between a "/" and a ".filename"
	if(imgUrls != null && imgUrls.length>0 && imgUrls != ''){//loop array
		var arr = jQuery.makeArray(imgUrls);//create array from regex obj	 
		$(arr).each(function(k){
			allImgs[k] = new Image(); //new img obj
			allImgs[k].src = settings.imgDir +'/'+ this;
//			console.log(allImgs[k].src);	
		});
	}
	return allImgs;
}