Any JavaScript/AJAX library to resize an image for upload?

[eluser]Optimus Prime[/eluser]
Hi! Thanks to all to reply this post.

In effect, Colin Williams is right. You must upload an image (the original size o previously resized) and the you can crop or resize the image using the GD library using the parameters generated with the javascript libraries (jQuery, Mootools, etc).

I have not found the solution to date. A javascript library that can resize to a smaller image before the uploading. And I think that it will not be possible in the future for security reasons.

I tried various libraries when I wrote this post. And at the end, I have choosed jCrop for jQuery for my current proyect. (thanks slowgary and fontella)

Uvumi Crop is great for projects with Mootools! (thanks CroNiX).