var ist_gNavRollover = new Object();
ist_gNavRollover = {initRollovers : function() {
		if (!document.getElementById) return
		var aPreLoad = new Array();
		var aImages = document.getElementsByTagName('img');
		var path_temp = document.URL.split("/");
		var path = [];
		for(var i=0; i<path_temp.length; i++){
			if(path_temp[i] != '' || i == 1){
				path.push(path_temp[i]);
			}
		}
		var stayPath = path[3] + "/" + path[4];
		var stayPathForm = "";
		(path[6] == "index.html") ? stayPathForm = path[3] + "/" + path[5] : stayPathForm = path[3] + "/" + path[6];			
		for (var i = 0; i < aImages.length; i++) {
			if (aImages[i].className.indexOf('imgover') > -1) {
				var src = aImages[i].getAttribute('src');
				var ftype = src.substring(src.lastIndexOf('.'), src.length);
				var hsrc = src.replace(ftype, '_o' + ftype);
				var asrc = src.replace(ftype, '_s' + ftype);
				aImages[i].setAttribute('hsrc', hsrc);
				aImages[i].setAttribute('asrc', asrc);
				aImages[i].setAttribute('osrc', src);
				aPreLoad[i] = new Image();
				aPreLoad[i].src = hsrc;
				if(aImages[i].parentNode.href.indexOf(stayPath) > -1){
					aImages[i].setAttribute('src', aImages[i].getAttribute('asrc'));
				}else{
					if(aImages[i].parentNode.href.indexOf(stayPathForm) > -1){
						aImages[i].setAttribute('src', aImages[i].getAttribute('asrc'));
					}else{
						aImages[i].onmouseover = function() {
							this.setAttribute('src', this.getAttribute('hsrc'));
						}
						aImages[i].onmouseout = function() {
							this.setAttribute('src', this.getAttribute('osrc'));
						}
					}
				}
			}
		}
		ist_gNavRollover.stay = undefined;
		if(ist_gNavRollover.stay != undefined){
			var stayObj = ist_gNavRollover.stay;
			stayObj.setAttribute('src', stayObj.getAttribute('asrc'));
			stayObj.onmouseover = stayObj.onmouseout = null;
		}
	}, gNavStay : function(category){
		var convertId = 'gNav' + category.charAt(0).toUpperCase() + category.substr(1);
		var gNavLi = document.getElementById(convertId);
		var gNavImg = gNavLi.firstChild.firstChild;
		ist_gNavRollover.stay = gNavImg;
	}
}

try{
	window.addEventListener('load', ist_gNavRollover.initRollovers, false);
} catch(e){
	window.attachEvent('onload', ist_gNavRollover.initRollovers);
}