/************************************
  APEX Controls Webpage JavaScripts
  Author: Will Calkins
  Date:   11/20/2009
 ************************************/

var timeout	= 500;
var closetimer	= 0;
var menuitem	= 0;

// open hidden layer
function showDropDown(id)
{	
	// cancel close timer
	cancelTimeout();

	// close old layer
	if(menuitem) menuitem.style.visibility = 'hidden';

	// get new layer and show it
	menuitem = document.getElementById(id);
	menuitem.style.visibility = 'visible';

}

// close showed layer
function closeDropDown()
{
	if(menuitem) menuitem.style.visibility = 'hidden';
}

// go close timer
function startTimeout()
{
	closetimer = window.setTimeout(closeDropDown, timeout);
}

// cancel close timer
function cancelTimeout()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = closeDropDown;