Border-Bottom in IE 5 is thicker ... why?

Hi

Could someone take a look at this please http://dmumford.bizhat.com/test.htm

You will see that in IE5 the border-bottom is about 2 pixels bigger than in other browsers, I have speciifed border-bottom:1px solid #fff;, but IE5 is making this bigger..........why????

Thanks for any help

Because both #nav and #nav li a have a bottom border, and IE is showing them separately.

Try changing your CSS to this:
#nav li a {
... other properties ...
border:0;
}
html>body #nav li a{
border-bottom:1px solid #fff;
}