I do it this way. Add these into your td tags.
PHP Code:
style="BORDER-LEFT: #000000 1px solid"
style="BORDER-TOP: #000000 1px solid"
style="BORDER-BOTTOM: #000000 1px solid"
style="BORDER-RIGHT: #000000 1px solid"
Obviously, if you have a complex table, you'll have to figure out what goes where. But yes, easy enough.