jQuery UI Slider Handle Not Showing

Here is the widget I am building: http://widgets.pegwise.com/720x90/

There are no javascript or css errors, and the background image I have for the handle is valid. Why is it not showing on th开发者_Python百科e slider in the lower right corner?

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Add CSS position:relative to and position:absolute to div#slider a.ui-slider-handle (just tested with FireBug).