/*
	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].className == 'imgover') {
			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('_o'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}

window.onload = initRollovers;


/* Rollover for tombstone images 
* requires prototype and scriptaculous */
function tombstoneRollover(obj) {
	/*Var declaration */
	var img		= $(obj).firstDescendant();
	var imgSrc	= $(img).readAttribute('src');
	var imgAlt	= $(img).readAttribute('alt');
	var imgPos	= $(img).cumulativeOffset();
	var imgLeft	= imgPos[0] - 72; /*(300-157)/2*/
	var imgTop	= imgPos[1] - 72; /*(300-157)/2*/

	/*create DOM elements first time 
	* Adding the onmouseout event here didn't work in IE (it didn't think the event existed: there must be a way around this)
	* Consequently, the DOM elements are added in the footer.php file directly */
	if (!$('tombstoneRollover')) {
		var imgOverContainer 	= new Element('div', { id:'tombstoneRollover'});
		var imgOver 			= new Element('img', { src: '', alt: imgAlt, onmouseout: 'tombstoneRollout()', id: 'imgOver'});
		$('container01').insert(imgOverContainer);
		$('tombstoneRollover').insert(imgOver);
	}
	
	/*sets image source, container position and container visibility */
	$('imgOver').writeAttribute({ src: imgSrc });
	$('imgOver').writeAttribute({ alt: imgAlt });
	$('tombstoneRollover').setStyle({position: 'absolute', left: imgLeft+'px', top: imgTop+'px'});
	$('tombstoneRollover').appear({duration: .25});
	
}

function tombstoneRollout() {
	$('tombstoneRollover').hide();
}