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komo123,
The problem is that you don't have content in your center blocks.
By default, IE collapses table cells with no content that do not have a width specified. Firefox does not. This is not a XOOPS bug, but a browser issue.
Add content to your center column and you will see everything staighten out just fine.
HTH.
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.