/*
	Standards Compliant Rollover Script
	Author : Daniel Nolan
	http://www.bleedingego.co.uk/webdev.php
*/

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].id == 'rollover' || aImages[i].id == 'rollover-nav') {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '-on'+ftype);

			aImages[i].setAttribute('hsrc', hsrc);
			
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;
			
			if( aImages[i].id == 'rollover-nav' )
			{
				var fName = src.substring(src.lastIndexOf('/')+1, src.length);
				var dsrc = 'http://www.cercorlearning.com/images/nav/descs/' + fName;
				aImages[i].setAttribute('dsrc', dsrc);
				
				aImages[i].onmouseover = function() {
					sTempSrc = this.getAttribute('src');
					this.setAttribute('src', this.getAttribute('hsrc'));
					document.images.navRoll.setAttribute('src', this.getAttribute('dsrc'));
					window.status = this.getAttribute('alt');
				}	
				
				aImages[i].onmouseout = function() {
					if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('-on'+ftype, ftype);
					this.setAttribute('src', sTempSrc);
					document.images.navRoll.setAttribute('src', 'http://www.cercorlearning.com/images/pixel.gif');
					window.status = '';
				}
			}
			else
			{
				aImages[i].onmouseover = function() {
					sTempSrc = this.getAttribute('src');
					this.setAttribute('src', this.getAttribute('hsrc'));
					window.status = this.getAttribute('alt');
				}	
				
				aImages[i].onmouseout = function() {
					if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('-on'+ftype, ftype);
					this.setAttribute('src', sTempSrc);
					window.status = '';
				}
			}
		}
	}
}

window.onload = initRollovers;