visualizer: generalize websocket address

visualizer/views/index.tpl

@@ -146,7 +146,7 @@
 			 * Websocket handling            *
 			 *********************************/
 
-			var ws = new WebSocket("ws://localhost:8080/websocket");
+			var ws = new WebSocket("ws://" + window.location.host + "/websocket");
 			ws.onopen = function() {
 				console.log("Websocket connected.");
 			};