Change page content with AJAX: Cannot set property 'innerHTML' of null

Hello,

First, I would like to say that this solution is a pleasure to use. Great work, thank you.

Here is my issue:
I use jQuery to update the content of a page dynamically. Part of the content that get updated is my <script> tag containing the url to my BOTR player (url I craft dynamically to point to the right video).

After the reload, it looks like jQuery is re-executing the <script> tag correctly, however, the Javascript code is failing. I got this error (pulled from the "chrome console"):

Uncaught TypeError: Cannot set property 'innerHTML' of null
botrObject.writePlayerdGKGYU1O-J8qoPyQ5.js:5
(anonymous function)

I thought that maybe, the javascript object was still containing an old reference to the previous content, so I tried to set it to null after my call return from jQuery. I got another error in this case, it looks like it's going further though.

Uncaught TypeError: Cannot read property 'swf' of null
(anonymous function)

It fails at this line:
var botr_UYiuQMD2_J8qoPyQ5 = new botrObject.swf(

I guess it's because the object has been set to null, but as per what's above it:
if(typeof(botrObject)=="undefined"){var botrObject={} [...]
I thought the object would have been recreated as it is set to undefined ...

I spent quite some time on this. Hopefully you guys could give me a hand.

Thanks a lot.