IE5 borders

Can someone please confirm my suspicion that IE5 on Windows is including
borders in the dimensions of a block object? The block in question has the
following css:

div.headerbox
{
position: relative;
left: 169px;
height: 70px;
margin: 5px;
margin-top: 0px;
width: 640px;
color:#99ffff;
background-color: #6699cc;
background-image: url(images/site/logotop.png);
background-position: top right;
background-repeat: no-repeat;
border: 2px solid #003399;
cursor: default;
z-index: 2;
}

and works fine in IE6, Mozilla 1.3, Opera 7.11, but is 4px too short in IE5.

Any ideas why its doing this wrong?
Thanks

David

Yes, Windows IE5.5 (and IE6 in Quirks mode) includes padding and
borders as part of the width and height values. A search for IE and
"box model" should reveal lots of pages that discuss this.

OK, I give up. I've moved to separate style sheets for different browsers.
Its working OK now so it'll have to do.
Thanks

David