My Header gets tiled on some user's computers

[orange peel]

The header/banner at the top of my forums : forum.theclubpenguincheats.com gets tiled on some users' screens because the forums is much wider on their computer. Someone on my forums said its because my forums is a percent-width forums not a fixed width and changing it to one would fix it. He said:

Regarding the header, change this code:

<table width="80%" border="0" align="center" cellpadding="0" cellspacing="0" class="wrapper">

Which is in the style part of the style. To make it a fixed width, make the following changes:

<table width="SIZEOFHEADERpx" border="0" align="center" cellpadding="0" cellspacing="0" class="wrapper">

I am not sure if the px is needed. May work without having px.
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Im just wondering if thats the best solution and if it works