Event.observe(window, 'load', function() {
	createRollovers();	
});
	
function createRollovers() {
	var rolls = document.getElementsByClassName('rollover');
	var i;
	for (i=0;i<rolls.length;i++) {
		var img = $(rolls[i]).down('img');
		var imgType = img.src.substr(img.src.lastIndexOf('.'));
		img._src = img.src.substr(0, img.src.lastIndexOf('.')) + "_on" + imgType;
		img._osrc = img.src;
			
		Event.observe(img, 'mouseover', function() {
			this.src = this._src;
		});
			
		Event.observe(img, 'mouseout', function() {
			this.src = this._osrc;
		});
			
		var preload = $(document.createElement('img'));
		preload.setStyle({display: 'none'});
		preload.src = img.src;
		document.body.appendChild(preload);
	}
};

function launchPopop(url, windowName, width, height) {
	newWindow = window.open(url, windowName, "width="+width+", height="+height+",scrollbars=yes,toolbar=1");
	newWindow.focus();
};