I was having trouble focusing on the screen a new window that was open through a javascript function, until today to demand in some forums discovered a way of doing it.

This way is valid for any resolution because the calculation of the position of the window is based on the size of each screen:

function openWindow()

{

      var winW = 600;

      var winH = 400;

      var winX = (screen.availWidth - winW) / 2;

      var winY = (screen.availHeight - winH) / 2;

      var features = 'left=' + winX + ',top=' + winY + 

                     ',height=' + winH + ',' + 'width=' + 

                     winW + ',status=yes,' + 'toolbar=no,

                     menubar=no,location=no';

      window.open('Teste.aspx', null, features);

      return false;

}

I hope this may be useful to someone.

This post is on my personal blog too, in portuguese languange, here.