function browserTest(){
	var browser=navigator.appName;
	if(browser=="Microsoft Internet Explorer"){
		document.getElementById("dropNav").style.marginLeft="-68px";
		document.getElementById("dropNav").style.marginTop="14px";
	}else{
		document.getElementById("dropNav").style.marginLeft="48px";
		document.getElementById("dropNav").style.marginTop="-8px";
	}
}


function dropMenu(){
	document.getElementById("dropNav").style.display="block";
	clearTimeout(t);
	var t=setTimeout("dropMenuHide()",4000);
}


function dropMenuHide(){
	//if(t)clearTimeout(t);
	document.getElementById("dropNav").style.display="none";
}

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.display = 'none';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.display = 'block';
}
// close showed layer

function mclose(){
	if(ddmenuitem) ddmenuitem.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;