How to make the product view pictures bigger?

[bizdetox]

Hey guys how do i make the product preview pictures in the thumbnail view bigger.
It is way too small?

I have attached the preview of my store so you guys can see what it look like.
PLEASE help !
Also in the Product page view. ITS way too small .
Do i zoom in the picture and save the picture like that i mean its not much difference.

[attachment cleanup by admin]

[jjk]

See here: http://forum.virtuemart.net/index.php?topic=95691.msg318496#msg318496
(The line numbers changed a little bit meanwhile)