var timeout         = 500;
var closetimer		= 0;
var ddmenuitem      = 0;
$(document).ready(function()
{
    //mclose();
});
// open hidden layer
function mopen(obj,id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
    var leftx=$("#"+obj.id).offset().left;
    var topy=$("#"+obj.id).offset().top;
    var span=10,span2=24;
	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	var len=ddmenuitem.getElementsByTagName("a").length;
	if(len>0)
	{
	    ddmenuitem.style.left = leftx+span+"px";
	    ddmenuitem.style.top=topy+span2+"px";
	    ddmenuitem.style.visibility = 'visible';
	}

}
// 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;