var Type = 'Z';
		
		if(document.getElementById) {
			Type = 'C';
			}
		else if(document.layers) {
			Type = 'B';
			}
		else if(document.all) {
			Type = 'A';
			}
			
		function shownav2(id)
			{
			if (Type == 'C') 
				{
				hideall();		
				document.getElementById("subnav" + id).style.visibility = "visible";
				}
			}
			
		function hidenav2(id)
			{
			if (Type == 'C') 
				{	
				document.getElementById("subnav" + id).style.visibility = "hidden";
				}
			}
			
		function hideall()
			{
			if (Type == 'C') 
				{	
				document.getElementById("subnav1").style.visibility = "hidden";
				document.getElementById("subnav2").style.visibility = "hidden";
				document.getElementById("subnav3").style.visibility = "hidden";
				}
			}