function OpenCenterPopUp(){     
    var Left=window.screen.width/2-175; 
    var Top=window.screen.height/2-175; 
    var Configuration="'toolbar=no, menubar=no, location=no, directories=no, status=no, resizeable=no, width=800, height=450, left=" + Left + ", top=" + Top; 
    window.open('http://tva.canoe.ca/cgi-bin/player/player_preroll.pl?titre=Reportage%20J.E.&emission=je&video=51691396001&reseau=TVA&promotion=&player=43787007001&publisher=43787007001&width=480&height=306','Acces',Configuration); 
}