[jQuery] Dialog has no scrollbars

[jtibbetts]

Scrollbars refuse to appear on my dialog box.

function LoadDialog (id) {
        $("body").append('<div id="dialog"></div>');
        $("#dialog").dialog( { title: 'Dialog', autoOpen: false, resizable:
false, width: '525px', height: '500px' } );
        $("#dialog").dialog("open").load("/in/content.php");
}

Calling this function creates a dialog box and loads "/in/
content.php", but scrollbars do not appear. The content in
"content.php" is much longer than the 500px height of the dialog box.

I've tried making it resizable or not, modal or not, draggable or not.
Nothing works.