Fluid rounded corners

[pein87]

I`ve been having some problems with making a fluid rounded corners for the catagory strips and one for below the forums. I`ve used a new table but theres a space in between the catagory and the forum itself. Would I make it so theres no border at all or change the classes for the tables? Also how wold I make a fluied rounded cornered top and bottom with a new table or a a new tr and td? If anyone could shine some light on this i wold appreciate this i`m not used to table layouts I can only do div based.