// JavaScript Document

if(window.addEventListener) {
	window.addEventListener("load", rollover, false);
}else if(window.attachEvent) {
	window.attachEvent("onload", rollover);
}else {
	window.onload = rollover;
};


function rollover(){
	if (document.getElementsByTagName('img')){
		var btn = document.getElementsByTagName('img');
		var preload_btn = new Array();	
			
		for (i = 0, len = btn.length; i < len; i++){
			if (btn[i].src.match("_off.")){
				var preload_btnOn = btn[i].src.replace("_off.", "_on.");
				preload_btn[i] = new Image();
				preload_btn[i].src = preload_btnOn;
				
				
				btn[i].onmouseover = function(){
					this.src = this.src.replace("_off.", "_on.");
				};
				btn[i].onmouseout = function(){
					this.src = this.src.replace("_on.", "_off.")
				};
			};
		};
	};
};