function show(){
			document.getElementById("arrow").style.display = "none";
			document.getElementById("arrow_down").style.display = "inline";
			document.getElementById("advsort").style.display = "inline";
		}

		function hide(){
			document.getElementById("arrow").style.display = "inline";
			document.getElementById("arrow_down").style.display = "none";
			document.getElementById("advsort").style.display = "none";
		}