jQuery UI dialog box not positioned center screen

Question

I have a jQuery dialog box that is meant to position in the middle of the screen. However, it seems slightly off-center vertically.

Here is the code:

Answer 1

$('#dlg').dialog({
    title: 'My Dialog',
    left: (parseInt(jQuery(window).width())-1200)/2,
    top:(parseInt(jQuery(window).height())-720)/2,
    width: 1200,
    height: 720,
    closed: false,
    cache: false,
    modal: true,
    toolbar:'#dlg-toolbar'
});