if (document.images) {
	var menuOff= new Array(5);	
		for (var i = 1; i <= 4; i++) {
			menuOff[i] = new Image;
			menuOff[i].src = "../img/menu" + i + ".gif";
		}
	var menuOn= new Array(5);	
		for (var i = 1; i <= 4; i++) {
			menuOn[i] = new Image;
			menuOn[i].src = "../img/menu" + i + "_on.gif";
		}
}

function chmenu(change,m){
	if(change=="on"){
		document.images["menu"+m].src = "../img/menu" + m + "_on.gif";
	}else if(change=="off"){
		document.images["menu"+m].src = "../img/menu" + m + ".gif";
	}
}