iframe fallback code for Firefox is not rendered

[ahmd]

I'm not sure if I'm doing something wrong, or what. I have the following code:

<iframe src="http://source">
<p><a href="http://source" target=_blank><img border="0" src="images/source.jpg"></a></p>
</iframe>

I was under impression that the stuff between the iframe tags will be rendered if the browser doesn't render the iframe itself, right?

Well, I'm testing it in FireFox 6.0 on a Windows platform, I went into setting and disabled JavaScript (which for some reason also disabled the iframes). So I load my page with the html above and the fallback code (inside the iframe tags) is not displayed at all. All I get is an empty space the size of the iframe object. Can someone tell me why?