SuperFish Jquery menu control not working properly in IE 9

SuperFish Jquery menu control not working properly in IE 9

The superfish menu control is not working in IE 9. on mouse over the menu is visible but the moment we scroll down to access the menu the menus dissappear.
If we refresh the page then the menu works properly. The issue comes only when we open the borwser and open the page having the superfish control for the first time.
This is owrking in all  other browsers as well as previous versions of IE (upto 8)
Urgent Help required