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[web] *!%$#ing JavaScript!

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Sorry to shove this in the lounge, but it's kinda urgent. I have an iframe and was editing its contents via document.getElementById(iframe_id).contentDocument.body.innerHTML This, or something very similar, was working earlier today. I deleted and re-typed the line and now instead of editing the frame, it throws an exception:
Error: uncaught exception: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMNSHTMLElement.innerHTML]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: file:///home/s0347735/Work/RF3k_map/maps/mapScript.js :: scrollTo :: line 279" data: no]
Interestingly, I can READ the innerHTML with no worries. Also, suddenly, frameobject.contentDocument.evaluate(anything) throws a "not enough arguments" exception. I've re-started firefox and examined the DOM and am now shedding tears of blood cos I overwrote the last working version (it was such a small change...). Please help. Make me look stupid if you have to.

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Source code? Well here's a stripped-down version.
<html><head><title>Test IFRAME</title></head>
<script type="text/javascript">
function doIt(){
<iframe id="my_if" width="300" height="300"
<br /><input id="my_in" type="text" value="Test Me" /><button type="button"

and view.xhtml is
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "">
<html xmlns="" xml:lang="en" lang="en">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" href="style.css" />
<title>IFRAME content</title>

<body style="background: white">
<p>Initial content</p>

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Now this is getting really odd. I changed the xhtml to an equiavlent html and include a function in bigview like this

function test(t){

And in the parent window have

Which worked. I changed alert(t) to document.body.innerHTML=t which again caused an exception

Then I put a width,height:100% div at position 0,0 and tried divobject.innerHTML=t which also crashed, which is odd since the same approach works in other web pages

Here's the really wierd part...

To test I wasn't going mad I added this to just before the </body>
<script type="text/javascript">test("abc")</script>

Not only does that work, but the existing code in the parent window successfuly sets the contents of the div as well!

Somehow it seems a page's contents can only be externally set if the page itself has performed a similar operation. If it's not a bug it's a pretty obscure feature.

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