function menuon($id){
		document.getElementById($id+'bg').style.backgroundImage = "url(images/menu_bg_on.png)";
		document.getElementById($id+'left').style.backgroundImage = "url(images/menu_left_on.png)";
		document.getElementById($id+'right').style.backgroundImage = "url(images/menu_right_on.png)";
}
function menuoff($id){
	document.getElementById($id+'bg').style.backgroundImage = "url(images/menu_bg.png)";
	document.getElementById($id+'left').style.backgroundImage = "url(images/menu_left.png)";
	document.getElementById($id+'right').style.backgroundImage = "url(images/menu_right.png)";
}