function toggleLayer(whichLayer)
	{
		var mem_type = document.getElementById("member_type")
		
		if ((mem_type.selectedIndex == 4) ||(mem_type.selectedIndex == 5))
		
			 
			{
				
				
				 if (document.getElementById(whichLayer).style.display == 'none')
					
					{
				
						if (document.getElementById)
						{
						// this is the way the standards work
						var style2 = document.getElementById(whichLayer).style;
						style2.display = style2.display? "":"block";
						}
						else if (document.all)
						{
						// this is the way old msie versions work
						var style2 = document.all[whichLayer].style;
						style2.display = style2.display? "":"block";
						}
						else if (document.layers)
						{
						// this is the way nn4 works
						var style2 = document.layers[whichLayer].style;
						style2.display = style2.display? "":"block";
						}
						
					}
				
			}
			
		
		else
			{
				
				var style2 = document.getElementById(whichLayer).style;
				style2.display = 'none';
  
			}
	}