Can I do this with the .swf or do I need the .fla?

Hi guys, for my online photo gallery I use a flash template that reads input from an .xml file...but I'd like to change the gallery a bit if possible. Unfortunately I don't have the .fla file, I only have the .swf. All I'd really like to do is create a link to my website URL, and maybe add a line of text for copyright purposes.

Can I do this with just the .swf file or am I out of luck without the .fla? Thanks!

fla = source code
swf = compiled code

you need the fla to make changes. however you can decompile the swf with 'an unspecified program' if your really have to.