// Image rollover

function initRollovers() {
	if (!document.getElementById) return
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByTagName('img');

	for (var i = 0; i < aImages.length; i++) {		
		if (aImages[i].className == 'rollover') {
			var src = aImages[i].getAttribute('src');
			var hsrc = src.replace('_off', '_on');

			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', '_off');
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}



// load event
function addLoadEvent(func) {
 var oldonload = window.onload;
	 if (typeof window.onload != 'function') {
		window.onload = func;
	 } else {
		 window.onload = function() {
		 oldonload();
		 func();
		 }
	 }
}

addLoadEvent(initRollovers);