var isMenuAct = false; // the menu is not active yet

function actMenuItem(lelayer) {
  isMenuAct = true; // the menu is now active
	showHideLayer(lelayer)
}

function inactMenuItem(lelayer) {
  isMenuAct = false; // the menu is no longer active
  if (document.images) {
    timerID = setTimeout('if (!isMenuAct) showHideLayer("0")', 10);
  }
}

function showHideLayer(lelayer)
{
			var isIE = false;
			var isOther = false;
			var isNS4 = false;
			var isNS6 = false;
			if(document.getElementById)
			{
				if(!document.all)
				{
					isNS6=true;
				}
				if(document.all)
				{
				 
					isIE=true;
				}
			}
			else
			{
				if(document.layers)
				{
					isNS4=true;
				}
				else
				{
					isOther=true;
				}
			}

			  
		if(isIE)
		{
			
			obj = document.getElementById('deroul1')
			obj.style.display="none"
			obj = document.getElementById('deroul2')
			obj.style.display="none"
			obj = document.getElementById('deroul3')
			obj.style.display="none"
			obj = document.getElementById('deroul4')
			obj.style.display="none"
			obj = document.getElementById('deroul5')
			obj.style.display="none"
			//------------------------------------------
			if(lelayer!="0")
			{
				obj = document.getElementById(lelayer)	
				obj.style.display="block"
			}
		}				
}