Javascript & back button behaviour in Firefox

This sounds like a simple request:  I wan't to run some Javascript when a
page has loaded, INCLUDING when the user has pressed the back button to get
to the page.

In IE I have no problem - both the onload event and a <script> block at the
bottom of the document fire fine.

In firefox, if you navigate to a page by pressing "back" in the browser that
page will not fire it's onload event, or execute any script in <script>
block at the bottom of the page.

Is this normal behaviour, or is something else on my page screwing it up?
How would you work around this?

cheers



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