512508 Javascript/CSS fix for Internet Explorer 8-9

Our website address is [login to view URL] (remove -) Visitors experience Javascript/CSS/JQuery issue when accessing site through Internet Explorer 8 and 9 versions. The problem is related to the main menu. If you click on any main menu link (any of 4) and do not move mouse after the click, you see the following: Page Loaded => White Empty Screen => Page appears Again. You would need to move mouse to make the white screen disappear. Sometimes we receive an error message related to the main menu problem, see attachment for more details. We need someone qualified to fix this main menu issue. Thank you for the time.