var timeout	= 500;
var closetimer	= 0;
var ddmenuitem	= 0;

// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

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

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';
	
	//hidedropdowns
	if (document.getElementsByTagName("SELECT").length > 0){
	 for (i=0;i<document.getElementsByTagName("SELECT").length;i++){
		document.getElementsByTagName("SELECT")[i].style.visibility="hidden";
		
	 }
	}

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	
	//showdropdowns
	if (document.getElementsByTagName("SELECT").length > 0){
	 for (i=0;i<document.getElementsByTagName("SELECT").length;i++){
		document.getElementsByTagName("SELECT")[i].style.visibility="visible";
		
	 }
	}
	
}

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

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

function hidedropdown(){
}

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