function show_hide_messages() {
			var x_position = ((screen.availWidth - 500)/2);
			//screen.availWidth/2-(screen.availWidth/2-500)-150;
			if(document.getElementById("layer_message").style.display == "none") {
				document.getElementById("layer_message").style.display = "block";
				document.getElementById("layer_message").style.left = x_position;
			}
			else {
				document.getElementById("layer_message").style.display = "none";
			}
		}