function ShowSubMenu(ex)
	{
		// document.getElementById("subnavlist").style.visibility="hidden";
		switch (ex)
		  {
		    case 1:  					
						document.getElementById("menu1").style.visibility="visible";
						document.getElementById("menu2").style.visibility="hidden";
						document.getElementById("menu3").style.visibility="hidden";
						document.getElementById("menu4").style.visibility="hidden";
						document.getElementById("menu5").style.visibility="hidden";
						document.getElementById("menu6").style.visibility="hidden";
						document.getElementById("menu7").style.visibility="hidden";
						document.getElementById("menu8").style.visibility="hidden";
						break
		    case 2: 
						document.getElementById("menu1").style.visibility="hidden";
						document.getElementById("menu2").style.visibility="visible";
						document.getElementById("menu3").style.visibility="hidden";
						document.getElementById("menu4").style.visibility="hidden";
						document.getElementById("menu5").style.visibility="hidden";
						document.getElementById("menu6").style.visibility="hidden";
						document.getElementById("menu7").style.visibility="hidden";
						document.getElementById("menu8").style.visibility="hidden";
						break
		    case 3: 
						document.getElementById("menu1").style.visibility="hidden";
						document.getElementById("menu2").style.visibility="hidden";
						document.getElementById("menu3").style.visibility="visible";
						document.getElementById("menu4").style.visibility="hidden";
						document.getElementById("menu5").style.visibility="hidden";
						document.getElementById("menu6").style.visibility="hidden";
						document.getElementById("menu7").style.visibility="hidden";
						document.getElementById("menu8").style.visibility="hidden";
						break
		    case 4: 
						document.getElementById("menu1").style.visibility="hidden";
						document.getElementById("menu2").style.visibility="hidden";
						document.getElementById("menu3").style.visibility="hidden";
						document.getElementById("menu4").style.visibility="visible";
						document.getElementById("menu5").style.visibility="hidden";
						document.getElementById("menu6").style.visibility="hidden";
						document.getElementById("menu7").style.visibility="hidden";
						document.getElementById("menu8").style.visibility="hidden";
						break
		    case 5: 
						document.getElementById("menu1").style.visibility="hidden";
						document.getElementById("menu2").style.visibility="hidden";
						document.getElementById("menu3").style.visibility="hidden";
						document.getElementById("menu4").style.visibility="hidden";
						document.getElementById("menu5").style.visibility="visible";
						document.getElementById("menu6").style.visibility="hidden";
						document.getElementById("menu7").style.visibility="hidden";
						document.getElementById("menu8").style.visibility="hidden";
						break
		    case 6: 
						document.getElementById("menu1").style.visibility="hidden";
						document.getElementById("menu2").style.visibility="hidden";
						document.getElementById("menu3").style.visibility="hidden";
						document.getElementById("menu4").style.visibility="hidden";
						document.getElementById("menu5").style.visibility="hidden";
						document.getElementById("menu6").style.visibility="visible";
						document.getElementById("menu7").style.visibility="hidden";
						document.getElementById("menu8").style.visibility="hidden";
						break
			case 7: 
						document.getElementById("menu1").style.visibility="hidden";
						document.getElementById("menu2").style.visibility="hidden";
						document.getElementById("menu3").style.visibility="hidden";
						document.getElementById("menu4").style.visibility="hidden";
						document.getElementById("menu5").style.visibility="hidden";
						document.getElementById("menu6").style.visibility="hidden";
						document.getElementById("menu7").style.visibility="visible";
						document.getElementById("menu8").style.visibility="hidden";
						break
			case 8: 
						document.getElementById("menu1").style.visibility="hidden";
						document.getElementById("menu2").style.visibility="hidden";
						document.getElementById("menu3").style.visibility="hidden";
						document.getElementById("menu4").style.visibility="hidden";
						document.getElementById("menu5").style.visibility="hidden";
						document.getElementById("menu6").style.visibility="hidden";
						document.getElementById("menu7").style.visibility="hidden";
						document.getElementById("menu8").style.visibility="visible";
						break

		    // And so on.. and so on..

		    // whatever is passed to switch that is not caught
		    // by the above fall under this category.
		    default:   
				document.getElementById("menu1").style.visibility="visible";
				document.getElementById("menu2").style.visibility="hidden";
				document.getElementById("menu3").style.visibility="hidden";
				document.getElementById("menu4").style.visibility="hidden";
				document.getElementById("menu5").style.visibility="hidden";
				document.getElementById("menu6").style.visibility="hidden";
				document.getElementById("menu7").style.visibility="hidden";
				document.getElementById("menu8").style.visibility="hidden";
			break
		  }
	}