/**
 * jQuery-Plugin "preloadCssImages"
 * by Scott Jehl, scott@filamentgroup.com
 * http://www.filamentgroup.com
 * reference article: http://www.filamentgroup.com/lab/update_automatically_preload_images_from_css_with_jquery/
 * demo page: http://www.filamentgroup.com/examples/preloadImages/index_v2.php
 * 
 * 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: 5.0, 10.31.2008
 * Changelog:
 * 	02.20.2008 initial Version 1.0
 *    06.04.2008 Version 2.0 : removed need for any passed arguments. Images load from any and all directories.
 *    06.21.2008 Version 3.0 : Added options for loading status. Fixed IE abs image path bug (thanks Sam Pohlenz).
 *    07.24.2008 Version 4.0 : Added support for @imported CSS (credit: http://marcarea.com/). Fixed support in Opera as well. 
 *    10.31.2008 Version: 5.0 : Many feature and performance enhancements from trixta
 * --------------------------------------------------------------------
 */

;jQuery.preloadCssImages=function(settings){settings=jQuery.extend({statusTextEl:null,statusBarEl:null,errorDelay:999,simultaneousCacheLoading:2},settings);var allImgs=[],loaded=0,imgUrls=[],thisSheetRules,errorTimer;function onImgComplete(){clearTimeout(errorTimer);if(imgUrls&&imgUrls.length&&imgUrls[loaded]){loaded++;if(settings.statusTextEl){var nowloading=(imgUrls[loaded])?'Now Loading: <span>'+imgUrls[loaded].split('/')[imgUrls[loaded].split('/').length-1]:'Loading complete';jQuery(settings.statusTextEl).html('<span class="numLoaded">'+loaded+'</span> of <span class="numTotal">'+imgUrls.length+'</span> loaded (<span class="percentLoaded">'+(loaded/imgUrls.length*100).toFixed(0)+'%</span>) <span class="currentImg">'+nowloading+'</span></span>')}if(settings.statusBarEl){var barWidth=jQuery(settings.statusBarEl).width();jQuery(settings.statusBarEl).css('background-position',-(barWidth-(barWidth*loaded/imgUrls.length).toFixed(0))+'px 50%')}loadImgs()}}function loadImgs(){if(imgUrls&&imgUrls.length&&imgUrls[loaded]){var img=new Image();img.src=imgUrls[loaded];if(!img.complete){jQuery(img).bind('error load onreadystatechange',onImgComplete)}else{onImgComplete()}errorTimer=setTimeout(onImgComplete,settings.errorDelay)}}function parseCSS(sheets,urls){var w3cImport=false,imported=[],importedSrc=[],baseURL;var sheetIndex=sheets.length;while(sheetIndex--){var cssPile='';if(urls&&urls[sheetIndex]){baseURL=urls[sheetIndex]}else{var csshref=(sheets[sheetIndex].href)?sheets[sheetIndex].href:'window.location.href';csshref=csshref.replace([window.location].protocol+"//"+window.location.host+"/","");if(csshref.match(/^https?:\/\//))continue;var baseURLarr=csshref.split('/');baseURLarr.pop();baseURL=baseURLarr.join('/');if(baseURL){baseURL+='/'}}if(sheets[sheetIndex].cssRules||sheets[sheetIndex].rules){thisSheetRules=(sheets[sheetIndex].cssRules)?sheets[sheetIndex].cssRules:sheets[sheetIndex].rules;var ruleIndex=thisSheetRules.length;while(ruleIndex--){if(thisSheetRules[ruleIndex].style&&thisSheetRules[ruleIndex].style.cssText){var text=thisSheetRules[ruleIndex].style.cssText;if(text.toLowerCase().indexOf('url')!=-1){cssPile+=text}}else if(thisSheetRules[ruleIndex].styleSheet){imported.push(thisSheetRules[ruleIndex].styleSheet);w3cImport=true}}}var tmpImage=cssPile.match(/[^\("]+\.(gif|jpg|jpeg|png)/g);if(tmpImage){var i=tmpImage.length;while(i--){var imgSrc=(tmpImage[i].charAt(0)=='/'||tmpImage[i].match('://'))?tmpImage[i]:baseURL+tmpImage[i];if(jQuery.inArray(imgSrc,imgUrls)==-1){imgUrls.push(imgSrc)}}}if(!w3cImport&&sheets[sheetIndex].imports&&sheets[sheetIndex].imports.length){for(var iImport=0,importLen=sheets[sheetIndex].imports.length;iImport<importLen;iImport++){var iHref=sheets[sheetIndex].imports[iImport].href;iHref=iHref.split('/');iHref.pop();iHref=iHref.join('/');if(iHref){iHref+='/'}var iSrc=(iHref.charAt(0)=='/'||iHref.match('://'))?iHref:baseURL+iHref;importedSrc.push(iSrc);imported.push(sheets[sheetIndex].imports[iImport])}}}if(imported.length){parseCSS(imported,importedSrc);return false}var downloads=settings.simultaneousCacheLoading;while(downloads--){setTimeout(loadImgs,downloads)}}parseCSS(document.styleSheets);return imgUrls};