function showmenu(){
	document.getElementById('menu').style.visibility = "visible";
	dw = new String((document.width)/2 - 70);
	document.getElementById('menu').style.left = dw + "px";
	py = new String(event.pageY);
	document.getElementById('menu').style.top = py + "px";
}
function showmenu2(){
	document.getElementById('menu').style.visibility = "visible";
	dw = new String((document.width)/2 + 60);
	document.getElementById('menu').style.left = dw + "px";
	py = new String(event.pageY);
	document.getElementById('menu').style.top = py + "px";
}