[ JS ] 팝업창 가운데 띄우기

 var sw  = screen.availWidth ;
 var sh  = screen.availHeight ;

 px=(sw - width)/2 ;
 py=(sh - height)/2 ;

 var set  = 'top=' + py + ',left=' + px ;
 set += ',width=' + width + ',height=' + height + ',toolbar=0,resizable=1,status=0,scrollbars=1' ;