var timeout	= 1000;
var closetimer	= 0;
var ddmenuitem1	= null;
var ddmenuitem2 = null;

// open hidden layer
function mopen(item1, item2)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem2 != null) ddmenuitem2.style.display = 'none';
	if (item1)
	{
	    ddmenuitem1 = document.getElementById(item1);
	    ddmenuitem1.style.display = 'block';
	}
	
	if (item2)
	{	    
	    ddmenuitem2 = document.getElementById(item2);
	    ddmenuitem2.style.display = 'block';
	}
}

// close showed layer
function mclose(id)
{
	if(ddmenuitem1 != null) ddmenuitem1.style.display = 'none';
	if(ddmenuitem2 != null) ddmenuitem2.style.display = 'none';
}

// 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; 
//window.onload = clearNav;