Hi
I not think there is a special name for a script that does what you need.
From what i understand, you need an "Ajax upload image" script that returns in the page the SRC address of the uploaded image. Than, a javascript function replace the SRC of the image in the mug with the returned address.
That is the ideea if someone wants to create that script or he/she knows about such a script, maybe in the jQuery plugins.
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