I have installed this MOD but I am having problems with the top menu border (see attachment). The top menu's border has no border and the bottom one is thicker the the normal thin border. I can't figure out how to fix.

With Menu Control, this is due to the fact that the program was designed to be placed in a certain position on your nav bar, therefore the box was given no border at the top, and a border at the bottom. Here this is emphasised by you seeing this output when positioned differently.

But how can I fix the border? I already figure out how to put the top border (changing a 'px0' value to 'px1' in the navbar template. But I still have the double line border on the bottom of the top navigtion bar.

create a line bottom border px0 at a guess.

Any idea where I would create / find where to put this and what the code should be?

Not really, you could try just on the same line as the top border bit

I figured it out. This is the beginning code that I have:

<!-- Menu Control - Version 1.3 Final -->
<div align="center">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="0" border="0" width="100%" align="center" style="border-top-width:1px">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="0" border="0" width="100%" align="center" style="border-bottom-width:0px">

Shouldn't need it twice. This should tidy things up

I tried that and it centered everything on the page.

Tried it again; now it works. Thanks Optrex.