function visi(nr)
		{
			var my_name = "sub_menu"+nr;
			
			if (document.layers)
			{
				document.layers[my_name].visibility = 'show';
			}
			else if (document.all)
			{
				document.all[my_name].style.visibility = 'visible';
			}
			else if (document.getElementById)
			{
				document.getElementById(my_name).style.visibility = 'visible';
		
			}
		}
		function hizi()
		{
			for(var i=1; i<=6; i++)
			{
				var my_name = "sub_menu"+i;
				if (document.layers)
				{
					document.layers[my_name].visibility = 'hide';
				}
				else if (document.all)
				{
					document.all[my_name].style.visibility = 'hidden';
				}
				else if (document.getElementById)
				{
					document.getElementById(my_name).style.visibility = 'hidden';
				}
			}	
		}