Sometimes in Safari the first click isn't sent to the popup

Question

I used different methods including "onclick" and jquery.

http://sky-walker.net/temp/test.htm

On Safari (for Windows at least), the first click after a popup appears (alert, prompt or confirm) isn't handled by the popup... e.g. in my test trigger a popup then hover or click on the checkbox... the first click doesn't register with the "ok" button...

Is there any workaround?

Thanks.