getURL - Navigation Menu

Well I created a Navigation Bar with 3 main buttons and 3 sub menus for each.

Now when I rollover the main button the submenu appears and the user has the ability to click on where they want to go.

Heres the problem.

ERROR: The submenu changes color (to red) when the mouse rolls over it. However, the problem is that everytime the mouse rolls over the submenu items, it doesnt always catch the “getURL” command. You have to keep moving the mouse around the submenu item for a while then it catches it. Its annoying and not user friendly. What is the problem here???