resize - Jquery resizing lost cursor -

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i create small resizing box (red dot resize): http://jsfiddle.net/a66zc/ works fine, when use mouse cursor slowly, when use cursor faster resizing blocking or doesn't work good. why? i'm fast?:p

just have done mouseup, should set mousemove on document..

example @ http://jsfiddle.net/gaby/a66zc/1/


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