CSS and table borders

Please take a look at http://www.dehildren.com/GulfCoastdevelopment.htm at
the table entitled "Existing Lots at the Reservation".  You will notice
heavy borders around each cell.  This is because I am using a style class
that specifies:

.thinblack { border: 1px solid black; border-collapse: collapse; }

I then am using:

<td class="thinblack">

However, the "collapse" attribute is NOT collapsing the borders of adjacent
cells.  I KNOW this can be done because I have seen it and even been
provided a working page with this feature, but cannot get it to work.

Can someone explain what I am doing wrong on this? It has me stumped.

Thanks,
Keith D Sellars
WebGraffix
www.webgraffix.com
"Making the Internet Easy"

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