the size of picture in thumbnail is tooooooooooo small
 

hi guys,
Did anyone ever try to change the default size of thumbnail picture??
This is too small. Also I would like to change the size of product-detail picture as well.---I mean to after making it bigger, I want to put it above the product description not on the left of it.
Does anyone know how to do it?
Thanks

There is an option under appearance options to chaneg the size of the thumbnails. I changed mine to 100 which seems like a good size.

Hi dsmall,
Thanks for the pointer. sorry I am a beginner.
btw, does anyone know where to change the width of column of categories?
The default size is too slim. When a category name comes to 3-4 words, it goes up to 2 lines :(