MultiFile upload disables the upload button.

MultiFile upload disables the upload button.

I am using MultiFile upload with ASP.Net. I have a CustomValidator control which calls a JavaScript function. However, after the functions is done executing, the upload button gets disabled.

I am putting the code on pastebin, because it looks more readable there http://pastebin.com/wPeGgWZk
I'd appreciate any help I can get.