/*
	Standards Compliant Rollover Script
	Original Author : Daniel Nolan
	http://www.bleedingego.co.uk/webdev.php
	Modifications by John Simons
	
	To use this, include
	<script src="rollover.js" type="text/javascript"></script>
	in the head, set any images' class to "imgover", and
	for any image.gif, include image_over.gif
*/

function initRollovers() {
	if (!document.getElementById) return;
	
	var aPreLoad = new Array();
	var tagsToConsider = new Array("img", "input");
	var sTempSrc;
	
	for (var j = 0; j < tagsToConsider.length; j++) {
		var aImages = document.getElementsByTagName(tagsToConsider[j]);
		
		for (var i = 0; i < aImages.length; i++) {		
			if (aImages[i].className == 'imgover') {
				var src = aImages[i].getAttribute('src');
				var ftype = src.substring(src.lastIndexOf('.'), src.length);
				var hsrc = src.replace(ftype, '_over'+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('_over'+ftype, ftype);
					this.setAttribute('src', sTempSrc);
				}
			}
		}
	}
}

// Append this to onLoad
if (typeof window.addEventListener != 'undefined') {
	//.. gecko, safari, konqueror and standard
	window.addEventListener('load', initRollovers, false);
} else if (typeof document.addEventListener != 'undefined') {
	//.. opera 7
	document.addEventListener('load', initRollovers, false);
} else if (typeof window.attachEvent != 'undefined') {
	//.. win/ie
	window.attachEvent('onload', initRollovers);
} else {
	//.. mac/ie5 and anything else that gets this far
	if (typeof window.onload == 'function') {
		var existing = onload;
		window.onload = function() {
			existing();
			initRollovers();
		};
	} else window.onload = initRollovers;
}