// JavaScript Document

window.onload = function () {
	
	$$('.btn').forEach(function(element) {
		element.addEvent('mouseover',function(){
			element.src = "images/btn/" + element.id + "_ro.gif";
		})
		element.addEvent('mouseout',function(){
			element.src = "images/btn/" + element.id + ".gif";
		})	});
	
};