1 px gap below my included tables

I created this website http://h2mp.com as you can see, right under the header there is a 1px gap from the header to where the body is.

This I believe is because I included the header on a seperate page within a table.

I am not sure how to get rid of this gap.

Here is a screenshot of how the page is setup.

The header is included using a php include tag, but I cannot get rid of this little gap between the included header and the body.

The cell space and pad is also set to 0, so that shouldn't have an effect.

Screenshot