> This mail got rather long, so here are my 3 questions in a short version:
> 1) What is GD? (fore use with imagecopyresampled function)

GD is an image library.  You need GD version 2.0.1 or higher to use 

> 2) How can I run a function that will tell me what version of GD is
> installed on my server, if any version at all?

phpinfo() would tell you.  Look for the block titled "GD".  If you don't 
see one, you don't have GD support in your PHP build.


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