table headers without specifying class would get the default
colgroupb would be used if there were adjacent groups
only the table headers would need to be set apart, not the table cells
I didn't use the html tag
since it doesn't seem to work in FF1, but does in IE6
pick any colors, I've just picked these because they contrast with .alternate
CSS:
th.colgroupa {background-color: #ddd}
th.colgroupb {background-color: #ccc}
From link-categories.php:
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