var timerID = null;

function closeall()
{	
			document.getElementById('dropdown1').style.visibility="hidden"; 
			document.getElementById('dropdown2').style.visibility="hidden";
			document.getElementById('dropdown3').style.visibility="hidden";
			document.getElementById('dropdown4').style.visibility = "hidden";
			document.getElementById('dropdown5').style.visibility = "hidden";

}


function openclose(drop){
	closeall();
	clearTimeout(timerID);
	document.getElementById(drop).style.visibility = "visible";
}