[PHP] Image manipulation

[Adam Plocher]

Hey I got a few questions about image manipulation.  
 
First of all, is there anyway I could have my script take a full size image
and crop out a chunk of it to be used as a thumbnail - or just simply shrink
the image down to be used as a thumbnail?
 
Also, is there anyway to convert misc image types (gif, bmp, png, etc) into
a jpeg?
 
Any help will be very appreciated, thanks.
-Adam Plocher