这是有关java的有关文档

				//
				function menuClose()
				{
					var counter;
					var tables = document.all.tags("table");
				
					for (counter = 0; counter < tables.length; counter++)
					{
						if (tables[counter].className == "menu")
						{
							tables[counter].style.display = "none";
						}
					}
				}
				
				function menuFocus()
				{
					window.event.cancelBubble = "true";
				}
				
				function menuOpen(target)
				{
					menuClose();
				
					document.all(target).style.display = "block";
				}