Modal plugin of Bootstrap 2 is not displayed by the center

Question

I use bootstrap modal plugin. But modal dialog is not shown in center. Why? my mistake?

http://dl.dropbox.com/u/573972/stackoverflow/bootstrap/modal.html

Answer 1

Based on p4810's answer above but deal with where the user is on the screen too. Works with absolute positioning.

$('#YourModal').modal().css(
            {
                'margin-top': function () {
                    return window.pageYOffset-($(this).height() / 2 );
                }
            });