CSS navigation problem

I have been trying to add another button to my navigation bar at http://hawaiiislandpreservationsociety.org/ ,but the layout 开发者_运维技巧messes up. What do I need to tweak to get it inline with the rest of the buttons?

Much Appreciated, Azeem

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#header ul 

change the width to 802px;

(then download Firebug)

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adding 2px (making it 802px) to the #header ul makes it display correctly for me in firefox.

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You mean the problem that "Blog" ends up on its own line? It seems like #go_learn has a padding defined which, combined with the width definition of 200px, ends up making the element actually 202px wide.