var subMenuPrefix='subMenu';
var linkPrefix='link';

function setMenu(id)
{
	var e = document.getElementById(subMenuPrefix + id);
	e.style.visibility="visible";
	
	var r = document.getElementById(linkPrefix + id);
	e.style.left = r.offsetLeft + 'px';
}

function hideMenu(id)
{
	var e=document.getElementById(subMenuPrefix + id);
	e.style.visibility="hidden";
}

function showUseless()
{
	var e = document.getElementById('useless');
	e.style.visibility="visible";
}

function hideUseless()
{
	var e=document.getElementById('useless');
	e.style.visibility="hidden";
}