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Preventing multiple popups

 
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Mac PPC Eclipse IDE Ubuntu
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Guys,

I have a hyperlink on click of which I call a javascript function and in that function I open a jsp page as a pop up using the window.open function of the dom. I would like to prevent multiple instances of this popup window being opened when one already exists?
 
Joe Harry
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Found this out by specifying a window name to the javascript function!
 
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