//MGSN

function displaydiv(divid)
{
    el = document.getElementById(divid);
	var display = el.style.display ? '' : 'none';
	el.style.display = display;
}



function Clear()
{
	 document.getElementById('S1').style.display = "none";
	 document.getElementById('S2').style.display = "none";
	 document.getElementById('S3').style.display = "none";
	 document.getElementById('S4').style.display = "none";
}