My site is pushed over to the right only in Firefox, I've had this problem for a while, I was hoping somebody might have some suggestions on how to fix it.

www.cobtree.com

Thank you.

The first thing you need to do is understand that Firefox is showing you the correct rendering of you code whereas IE 99.9% of the time is doing it WRONG. Use Firefox as your base, then fix for IE where necessary.

The first thing I'm going to tell you is to dump the tables for layout. Learn to use CSS and divs and you'll be much better off in the end.

Second, your first td is holding a background image but you have no width set for that td. The TD where the bulk of your site is sitting is set to a width of only 10%, so as a matter of math, the first TD is going to take up the remaining 90%! The 10% td is going to get pushed over AFTER the 90%

Give the 1st TD a smaller set width, remove or modify the width on the second.

+1 for using Firefox as base browser.
You can check with Opera too.

If you are using Firefox, use "Web Developer" add on. It has all the features to debug your design.

At top table you have set the width as 700 and in the bottom table you have set the width as 703.

If you cleanup the HTML, the design will be right.

Right, I think you have mix up table and div layouting. You have one 700px width table at the top and use a 700px width div to holding a 703px width table and the table do have a cellpadding of 5px.
I think you should setup the width of second table to 700px and its cellpadding to 0px as the top one. Just delete the div would be OK.