function mainDisable(id)
		{
			var el = document.getElementById(id);
			el.style.display="none";
		}

		function mainEnable(id)
		{
			var el = document.getElementById(id);
			el.style.display="block";
		}

		function mainSelect(id)
		{		
            mainDisable("what");	
			mainDisable("portfolio");
			mainDisable("resume");
			mainDisable("contact");
			mainEnable(id);
		}