function appel(){
{

	Navig=navigator.appName
  NavVers = navigator.appVersion;
  nav = NavVers.charAt(0)
  if (Navig=='Netscape')
  {
		if(nav=='4')
		{
			var i;
			var ch;
		
			for(i=1; i<4; i++)
			{
				ch = "window.parent.principal.document.EL" + i;
				eval(ch).visibility = "hidden";
			}
		}
		else
		{
				
			var i;
			
			for(i=1; i<4; i++)
			{
				ch = "window.parent.principal.document.getElementById('EL" + i + "').style";
				eval(ch).visibility = "hidden";
			}
			
		}
	}
	else
	{
				
		var i;
		  
		for(i=1; i<4; i++)
		{
			ch = "window.parent.principal.document.all.EL" + i + ".style";
			eval(ch).visibility = "hidden";
		}
	}
}
}
if (document.layers) {  //cache les menus
document.captureEvents(Event.MOUSEUP);
}
document.onmouseup=appel;
appel();