function menuOver(obj) {
	var buttonX = obj.offsetLeft;
	var buttonY = obj.offsetTop;
	var buttonW = obj.width;
	var buttonH = obj.height;
	var pic = document.getElementById("menu_a");
	pic.style.display = "block";
	pic.style.position = "absolute";
	pic.style.left = buttonX+Math.round(buttonW/2)-4+"px";
	pic.style.top = buttonY+buttonH-3+"px";

}
function menuOut() {
	var pic = document.getElementById("menu_a"); 
	pic.style.display = "none";
}