just to add, my firefox browser has enabled javascript
thanks!
"pdc" <pdc@cdp.moc> wrote in message
news:lClIf.1896$_D5.183975@news20.bellglobal.com.. .[color=blue]
>I have two web servers that I use, one is the primary and the other is a
>backup for when the server is down.
> I use a third, central server which redirects a browser's initial link to
> one of my web servers.
> Rather than getting involved with CGI to determine the status of the web
> servers, I found and implemented the following javascript.
>
> <!- this is a very simple page that uses javascript to detect
> whether or not a gif file can be obtained from a system's
> web server.
> If the gif file cannot be found, either because the system
> is down or the webserver is inactive, then the imageError
> function redirects the browser to a backup server.
> -->
> <head>
> <title>PDC's start</title>
> <SCRIPT LANGUAGE = "JavaScript">
> <!--
> function imageError()
> {
> top.location = "http://webserver2/home.html";
> }
> function imageLoad()
> {
> top.location = "http://webserver1/home.html";
> }
> var imgTest = new Image();
> imgTest.onerror = imageError;
> imgTest.onload = imageLoad;
> imgTest.src =
> "http://webserver1/ThisGIFimageControlsWhichWebServerisChosen.gif";
> -->
> </SCRIPT>
> <HTML>
>
> IE. the redirection proceeds as required. Trouble is, I don't want to use
> IE.
>
> Using Firefox (1.5.0.1)
> What I notice is that it is only partially successful in doing what I
> want. If I rename the gif file, for example, the redirect works well and
> webserver2 is chosen.
> But if webserver1 or the machine that webserver1 runs on is down, then the
> initial request fails, still trying to access webserver1/home.html
> Is this WAD, or is there anything I can tweak to ensure that when
> webserver1 is unavailable then webserver2 is accessed?
>
>
>[/color]
