Hey, sorry for my late reply, I was away for a bit. What in particular is the problem with the forum?

Browser: Mozilla Firefox 4.*

OS: Windows 7

i have looked over the code many times but i just can not figure out why it is not working when you click edit reply a drop down is supposed to come but it doesnt do anything it is strange and realy annoying because it messes up my site a lot

Browser: IE 8

OS: Windows

The $(this) selector doesn't have any children in that context, you need to use $(this).parent() as per this modified example http://scutterman.com/Bravenet/js-show-hide/

As an aside, ensure your dom structure is valid, and try not to use depreciated elements like - the W3C validator and a valid doctype can help with this.
If you look at the example, some of the structure and css has been modified to adhere to XHTML 1.0 Strict.
I'm not sure of the doctype or underlying structure of your live version, but I usually work in strict to ensure future compatibility.