PHP & Images

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How is it possible to resize images and to add their dimension at the bottom like it is done at imageshack.com?????:confused:

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http://www.w3schools.com/html/tryit.asp?filename=tryhtml_images_adj
http://www.w3schools.com/html/html_images.asp

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Thats not what I actually meant.
I want to resize images like it is done at imageshack.com where you just tell them what resolution u want & they convert it like u would in photoshop or picasa.
What I want is a script that would resize the image