[405hp]

You can tell if it doesn't pop

                TheNewWin =window.open ('myscript.php','mywindow',config='height=620,width=915,toolbar=no, menubar=no,location=no, directories=no, resizable=no');
                  if(TheNewWin)
                    TheNewWin.moveTo(10,10);
                   else
                    alert('Please disable your popup blocking software!');

But I've found that the newer browsers ignore some of the directives I've used anyway.