jQuery UI.tooltip position:fixed;

jQuery UI.tooltip position:fixed;

When using the tooltip widget (in development, I know) the positioning of the tooltip failes if my browser viewport is not on the top of the document (scrollTop > 0). The same happens in the demo at http://wiki.jqueryui.com/Tooltip. I have tested in FF3 and IE8.

Changing the positioning from "position:absolute;" to "position:fixed;" in the tooltip css solved the problem. Is this the correct fix or is this causing other problems?

Thanks, Bart