My incursion into the land of DOM scripting hit upon another difference between IE and Firefox, another simple example…
<Div id="test">
Hello there
</Div>
The task, use JavaScript to change the text in the Div, easy eh?
document.getElementById("test").firstChild.value = "new text"
or
document.getElementById("test").innerText = "new text"
Well, turns out I used both! IE seems to like the 2nd and Firefox the 1st, with neither complaining about the other. Now I can see why the AJAX libraries have their DOM abstraction functions!