Select area at image with jQuery

i know how to select area of image, with jQuery plugin ofcause. Here is http://publikz.com/one-more-task-rounded-selection-in-jquery/ shot example (click link "Here is example").

But want also - to know how to make round se开发者_JAVA技巧lection, i.e. wysiwig selection. How to make round thumbnail - this is just another php task, nothing more.

Can anybody help me with ideas?face

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Here is example. Drag the yellow pointer ... http://publikz.com/projects/roundsel-v2/