Thanks for the suggestion - this was actually something that I had not thought about.

The downside of integrating a new control with an existing project (that’s actually composed of a bunch of other controls) makes it difficult to fully be aware of other developer’s implementations.

I know this particular post tends to get a lot of hits so I’ll be sure to edit the post and include your suggestions.

Tom

and at the second time use the dom loaded event to trigger all your scripts that modify dom, you can see implementation of the dom loaded in libraries such as
prototype.js:
document.observe(’dom:loaded’, function () { /* your script goes here */ }),
mootools:

document.addEvent(’domloaded’, function () { /* your script goes here */ })

jquery:
jQuery(document).ready(function () { /* your script goes here */ })

I used the second method (dom loaded event) and it worked fine until the day the same error happened, I wonder and try to find out what was going wrong. after validating the content I discovered an unclosed tag. I solved this problem and anything is fine now