function makeinvisible()
{
var browserName=navigator.appName; 
if (browserName=="Microsoft Internet Explorer") 
{
 var submenu1 = document.getElementById("submenu");
 submenu1.style.display = 'none';
 }
}

		
function makevisible()
{
 var browserName=navigator.appName; 
 if (browserName=="Microsoft Internet Explorer") 
 {
  var submenu1 = document.getElementById("submenu");
  submenu1.style.display = 'block';
 }
}