lucy24 - 12:33 am on Dec 12, 2012 (gmt 0)

For starters:
#1 read the Forums rules. No links to your own site.
#2 validate the html and the css.

You're expected to do the basics yourself.

Picking one thing at random: "border-collapse" is not a cell property. It is a table property. The default value is "separate", meaning that each cell will have its own border.

Why are the bold and italic properties applied to both the table and the cell? font-style and font-weight are both inherited, so once they're applied to a table, everything inside the table will have the same properties unless you explicitly say otherwise.

You've redefined "td" twice after its initial definition.

#table-3,tr,th,td
and
#table-2,td
do not mean "cells within table-3 or table-2", they mean "all cells everywhere". If you mean
#table-3 td
and similar, then say so.

Is
#table-3, {border-collapse:collapse; border:0px solid black;border-style:hidden;}
a typo? The trailing comma makes the whole thing into one big parse error. This is just as well, since "hidden" makes all other border statements meaningless-- unless they are overridden by other declarations later in the CSS.

See above about basics. You can also view the offending page in one of the many browsers that has a "developer" feature (exact name depends on browser). Firefox is one of them.