How do I get the full height of a webpage that uses a master page?

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I'm writing a script that creates a popup that dims the screen behind the popup. I'm using JQuery's $("#dim").css("height", $(document).height()); to resize the div element in question, but it doesn't cover the master page area. Is there a way I can get the height of the WHOLE page and not just the child page?

EDIT: The problem may actually lie in the positioning, and not the size, of my div. I have it set to top:0, but maybe I need to move it using javascript?


Give this a shot:

var width = screen.availWidth;
var height = screen.availHeight;