javascript open() function returns undefined

The javascript function open() specs like "fullscreen", "width", "height", seem not to work under Safari while they do under Firefox, Opera and even Explorer. So, I open a popup with : Win=open("","","") and then , I use Win.resizeTo(,) where and was evaluated previously . But I obtain the message : "TypeError : 'undefined' is not an object (evaluating Win.resizeTo)".

 

I found several problems with Safari (performance different from other browsers), and up to now, I managed to get round the problem. But in this case, I go blank !!!

Please, can you help me to produce a code visible by Safarists ;o)

 

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