Using tables for layout is NOT recommended: it’s bad coding. This is what the float
property is for.
http://www.w3schools.com/css/css_float.asp
While you are learning about that, add this to custom css:
table td {border:none;}
These aren’t lines or rules, but borders.
http://www.w3schools.com/css/css_border.asp
Also, the use of the <center>
tag has been deprecated. Neither Graphene nor WordPress use frames, btw.