dupa o zi de cautari si chinuri am gasit un mic tutorial care arata cum poti seta lungimea unei coloane in css, sa fie egala cu cealalalta coloana
http://matthewjamestaylor.com/blog/equal-height-columns-cross-browser-css-no-hacks (http://matthewjamestaylor.com/blog/equal-height-columns-cross-browser-css-no-hacks)