Category Archives – changes

Hi,

Can I change appearance this site? http://kubikjiri.cz/?cat=4 ?

I can looks like this site: http://kubikjiri.cz/?page_id=224. This site is devided into two columms. And into right columms I added some widgets. But I don’t know, how can I devided a category Archives sites to two columms (like the first site and link above)….

Thanks