I'm using datepicker to display a calendar when a user clicks a button.  The calendar doesn't seem to be displaying in the correct location when the date field is towards the edge of the visible screen. 

 

In IE8, if the date field is towards the lower right corner of the screen, the calendar is displaying off both the right and bottom edges of the visible screen.  In the same situation in Firefox, the calendar is displaying off the bottom edge of the visible screen, but has appropriately shifted to the left so the full calendar width is displayed.

 

Has anyone else encountered this behavior? Is there something I should check for that could be interfering with the automatic positioning?