function initRollovers() {
	if (!document.getElementById) return
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByClassName("rollover");


	for (var i = 0; i < aImages.length; i++) {
		if (aImages[i].getElementsByTagName('img')) {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_o'+ftype);

			aImages[i].setAttribute('hsrc', hsrc);
			
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;
			
			aImages[i].onmouseover = function() {
				sTempSrc = this.getAttribute('src');
				this.setAttribute('src', this.getAttribute('hsrc'));
			}	
			
			aImages[i].onmouseout = function() {
				if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('-on'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}

document.getElementsByClassName = function(classname) {
	var elements = new Array();
	var re = new RegExp('(^| )'+classname+'( |$)');
	var ael = document.getElementsByTagName('*');
	var op = (navigator.userAgent.indexOf("Opera") != -1) ? true : false;
	if (document.all && !op) ael = document.all;
		for(i=0, j=0 ; i<ael.length ; i++) {
			if(re.test(ael[i].className)) {
				elements[j]=ael[i];
				j++;
			}
		}
	return elements;
};

window.onload = initRollovers;