Center a popup window on screen?

Question

How can we center a popup window opened via javascript window.open function on the center of screen variable to the currently selected screen resolution ?

Answer 1

My recommendation is to use top location 33% or 25% from remaining space,
and not 50% as other examples posted here,
mainly because of the window header,
which look better and more comfort to the user,

complete code:

    


    click on me

check out this line:
var top = (screen.height - h) / 4; // for 25% - devide by 4 | for 33% - devide by 3