Load a picture - crop it and save it back as jpg

Hi,
I need to build a flash application In which I load a jpg, make a selection of it (a mask or something like crop tool) and save it back. Loading the picture and making the mask are not a problem. What I need is some help with saving the edited picture back.
So can you help me with this, or can you give me some tips where to look at.
Thank you in advance!

Hi CaioToOn!
First of all thanks a lot for the reply. Sorry for not doing that sooner, but I wanted to explore it a little before.
My application is almost set, load the image, made the crop, save It to a server with a php and all good until here.
Now I want to drag the image, make a scale of it and for that I used an Matrix (also done).
My problem came when I wanted to position the image holder on X and Y, as soon the picture loads . After doing that my new cropped image goes strange.
I know it seams like a noob question but I'm kinda of stuck.
Can you please take a look at my code here, because it’s drives me crazy and I can’t figure it out.
Thanks a lot,
Andrei

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Load a picture - crop it and save it back as jpg

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