>I tried window.stop() and it did stop the page, but then I got an error message letting me know that this method was not supported.
For ie, you can do it for instance with frame element by execCommand("stop"). For ff/nn, window.stop() usually should do. Hence, something like this for iframe.
[tt]
if (document.all) {
document.getElementById("iframe_id").document.execcommand("stop");
} else {
window.stop();
}
[/tt]
Universal? don't know.