Help with image size

[Valamforth]

Hello there...im using OScommerce 2.2 RC2 and i was wondering how could i change the size of my images....All the images i add they have the same

size no matter what...and i would like them be a little bigger. Hope i can get some help and sorry if this was already discussed in other side, but i read a couple threads and i couldnt find help there

 

Thanks for ur time