Traumwind - JS on-/offline switcher

What I'm trying to do:
I have a HTML page on the local (file-)system. If it get's loaded, some JS needs to decide if a (online) address is reacheable, and load that or another local page accordingly...

I'm looking for ideas of hpw to discover if a remote URL is reacheable in JavaScript... maybe by doing some kind of var rimg = new Image(remoteUrl); kind of thing...

I'm open for suggestions on this.

This seems to work ok;


<html>

     <head>

     <title>On-/Offline Tester </title>

     <script language="JavaScript" >

             switchUrl =
    "file:///C:/locals/index.html"; 

     </script>

     <script src="http://remote.tld/switchUrl.js"
    language="JavaScript" ></script>

     </head>

     <body onload="location.href=switchUrl;" >

     <h1>On-/Offline Tester </h1>

     </body>

    </htmö>



#### in the switchUrl.js ####

switchUrl = "http://remote.tld/index.html";

No, that's too easy, isn't it? the remote *.js file is CACHED by IE and others!!!

Ah, Danke Andi, so geht's:


var randNum = Math.random ();

document.write("<scr"+"ipt src=\"http://remote.tld/switchUrl.js?"+randNum"\" language=\"JavaScript\"></scri"+"pt>);

Replacing the second script tag with the static *.js URL by an dynamic' URL prevents caching nicely :) <

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