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How can I catch a browser timeout and execute my own error message?

I have a web page (classic asp) with a link to a local IP address, as follows:

<a href="">Link</a>

If the local IP address is unavailable the web browser eventually times out and displays its own error message.

What I want to do is: catch the timeout before the browser displays its default error page and display an error on the same web page, next to the “Link”.

e.g. <a href="">Well Pump</a><div id="timeoutmsg">offline</div>

I am guessing I need some JavaScript and the timeout function, but I don’t know where to begin.



Found this awesome workaround using pure javascript, no JScript, no ajax, no external libraries.
Works at treat:
Just need to upload a “test.gif” file to the local site(s).

var url = '';
var img = new Image();
img.src = url + '/test.gif';
img.onload = function() {
    document.getElementById("msg").innerHTML = "";
    window.location.href = url;
img.onerror = function() {
    document.getElementById("msg").innerHTML = "offline";