Trick firefox
 

I need help my forum left table loads first than my actually forum ! ie or opera has no problem loading everything together so i wonder is there a firefox trick for loading the forum?

No. Firefox (and I thought Opera too, obviously not) render tables slightly differently. Firefox just shows it as it comes, IE waits until the whole page has been downloaded then displays it.

Usually IE's way is slower, but means things don't jump around as they load which might happen in Firefox.

The parent is correct. IE will wait on all data inside of a table to be downloaded before rendering it. Firefox and some other browsers will render the table while the data inside of it is being downloaded.

One method is not any better than the other. Both development teams have their own reasons for using each method. As long as the end result (fully loaded web page) looks the same (or nearly the same) between most browsers your end users will probably not care about what loads when and how.