How to change the text input value to none in this existing project upon focus, in jquery

I have this so far: http://jsfiddle.net/26eVE/4/ I want that when the user clicks on the small input field (that one with value 1 as default), the value changes from 1 to "". EDIT: Also after the focus is not on the input (the user clicks somewhere else after clicking in the input), show the default value 1 if the user didn't type anything inside the text input, otherwise keep the input he typed in.

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