Opening jQuery popup to display outside the iframe ?

I am trying to use jQuery popup to display outside the iframe on the parent window.

  But because of iframe its coming at the bottom .It should come as a popup on the centre of the screen. 

 Is there a way to position the jQuery popup on centre of screen while using iframe on the parent window

 Issue:

  The jQuery popup dialog box is opening down open at the bottom of the iframe.

  Actually it should come at the centre of the screen.

 The jQuery code I am using to open the dialog is

 NameAndLocation = $("#dlgNameAndLocation").dialog({ height: 420, width: 600, top:100, modal: true, resizable: false, bgiframe: false })

        $(".ui-dialog-titlebar").hide();

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