Fix the lib for v0.5 and v0.6 of nodejs. It's also backward compatible with v0.4

lib/websocket.js

@@ -5,7 +5,10 @@ var events = require('events');
 var http = require('http');
 var net = require('net');
 var urllib = require('url');
-var sys = require('sys');
+
+var reg = /^v0.([0-9]+)/i.exec(process.version);
+var oldVersion = reg ? +reg[1] <= 4 : false;
+var sys = oldVersion ? require('sys') : require('util');
 
 var FRAME_NO = 0;
 var FRAME_LO = 1;
@@ -473,9 +476,15 @@ var WebSocket = function(url, proto, opts) {
         switch (getUrlScheme(url)) {
         case 'ws':
             var u = urllib.parse(url);
-            httpClient = http.createClient(u.port || 80, u.hostname);
             httpPath = (u.pathname || '/') + (u.search || '');
             httpHeaders.Host = u.hostname + (u.port ? (":" + u.port) : "");
+            var options = {
+               port: u.port || 80,
+               host: u.hostname,
+               path: httpPath,
+               headers: httpHeaders
+            };
+            httpClient = oldVersion ? http.createClient(u.port || 80, u.hostname) : http.request(options);
             break;
 
         case 'ws+unix':
@@ -581,7 +590,7 @@ var WebSocket = function(url, proto, opts) {
             errorListener(e);
         });
 
-        var httpReq = httpClient.request(httpPath, httpHeaders);
+        var httpReq = oldVersion ? httpClient.request(httpPath, httpHeaders) : httpClient;
 
         httpReq.write(challenge, 'binary');
         httpReq.end();