improving log function to work on IE8 and IE9 too

misc/js/pushstream.js

@@ -76,12 +76,28 @@
   };
 
   var Log4js = {
+    logger: null,
     debug : function() { if  (PushStream.LOG_LEVEL === 'debug')                                         Log4js._log.apply(Log4js._log, arguments); },
     info  : function() { if ((PushStream.LOG_LEVEL === 'info')  || (PushStream.LOG_LEVEL === 'debug'))  Log4js._log.apply(Log4js._log, arguments); },
     error : function() {                                                                                Log4js._log.apply(Log4js._log, arguments); },
     _log  : function() {
-      if (window.console && window.console.log && window.console.log.apply) {
-        window.console.log.apply(window.console, arguments);
+      if (!Log4js.logger) {
+        var console = window.console;
+        if (console && console.log) {
+          if (console.log.apply) {
+            Log4js.logger = console.log;
+          } else if ((typeof console.log == "object") && Function.prototype.bind) {
+            Log4js.logger = Function.prototype.bind.call(console.log, console);
+          } else if ((typeof console.log == "object") && Function.prototype.call) {
+            Log4js.logger = function() {
+              Function.prototype.call.call(console.log, console, Array.prototype.slice.call(arguments));
+            }
+          }
+        }
+      }
+
+      if (Log4js.logger) {
+        Log4js.logger.apply(window.console, arguments);
       }
 
       var logElement = document.getElementById(PushStream.LOG_OUTPUT_ELEMENT_ID);