function showmenu(n)
 		{
 		for(i = 1; i < 6; i++)
 			{
 			if(n == i)
 				{
 				document.getElementById("menu"+i+"").style.display = "block";
 				}
 			else
 				{
 				document.getElementById("menu"+i+"").style.display = "none";
 				}
 			}
 		}