The border-spacing property is one. It accepts 1 or 2 length values. If 2 values; one is the horizontal spacing and the other is the vertical spacing. If only 1 value it's both. This one doesn't work in IE though.
There's also the border-collapse property, which /is/ supported by IE. border-collapse: collapse; removes spacing between cells, this is the same thing as boder-spacing: 0; declaration.
HTH!
Regards,
Rich
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