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How do I check if a window is already open or give it focus using Flex/Flash

Joel_Sisko asked
Last Modified: 2013-11-11
Dear Experts,

I have this code that will open the url as expected. The issue is that if I click the help button again that calls the fucntion, it opens a copy of the window that is already opened. How do I check that the window is already open and if so, give it focus?

private function PopWindow (HelpUrl:String): void {
	ExternalInterface.call('window.open', HelpUrl , '_blank','scrollbars=yes,resizable=no,width=400,height=400');

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