Hi,
In regard to the IE 7 issue with the menu on the index page. The reason for this issue is because when you hover over the second level of the menu, you are now outside the menu container and you looses focus and that is why the second level disappears unless you do it quickly. And the reason you looses focus is if you compare the home page to the other pages you will see that all other pages have a taller menu container which contains the shadow image under the menu and that is why this only occurs on the index page.
And since this only happen on IE 7, we can add an IE conditional statement to fix this issue. On the index page, please go to the end of line 54 and press enter and paste the following code there:
<!--[if lte IE 7]>
<style>
#outerWrapper #navWrapper {
padding-bottom:22px;
}
</style>
<![endif]-->
I will do further debugging to find a fix without changing the look and feel of the home page. Meanwhile, please use the fix above.