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';
	
	var objPere = ddmenuitem.parentNode;
	var posLeft = objPere.offsetLeft;
	
	if (ddmenuitem.offsetWidth > 152)
	{
		posLeft = posLeft - (ddmenuitem.offsetWidth - 152)/2;
	}
	else
	{
		posLeft = posLeft + (152 - ddmenuitem.offsetWidth)/2;
	}
	if (posLeft + ddmenuitem.offsetWidth + 18 > document.getElementById("NavigPrinc").offsetWidth)
	{
		var diff = (document.getElementById("NavigPrinc").offsetWidth - (posLeft + ddmenuitem.offsetWidth))*-1;
		var pos = posLeft + ddmenuitem.offsetWidth;
		ddmenuitem.style.left = posLeft-diff+"px";
	}
	else
	{
		ddmenuitem.style.left = (posLeft+3)+"px";
	}
}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

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

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

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