product image getting cut off

[chrisneils]

some of my product images are getting cut off on the product page.

 

they look fine when they're being displayed with all of the other products (not sure what to call that page) but when you click on the product and are viewing it, some of the image is getting cut off.

 

i'm assuming this is because the my images are too big for the default oscommerce settings... how can i make my images fit??

 

Thanks!