I'm currently using the Dropdown HTML Control to create a dropdown menu for my navigation. You can see the effect here by hovering over the 'Sheets' navigational item.

I'm concerned because

1) I want to be 100% sure the links in the dropdown which appears are read by search engines
2) It seems that the JS used for the dropdown means the user has to agree to 'Allow Active X' controls for it to work property.

Is there a pure-CSS approach to this type of dropdown which would avoid these 2 issues?