I'm guessing you mean having the flat single-pixel table borders instead of the big bulky 3d things?
Make a 1x1 celled table with the background color of what you want your table borders to be. Set border and cellspacing and cellpadding to 0. Then make another table inside that one that has as many cells as you want. Set it's border to zero, cellspacing to 1, and cellpadding to whatever you want it to be.
I'm pretty sure that's how it's done.
---Skorpion
