Adding drop down divs to content
It sounds like you could use something like Field Group and use Horizontal Tabs, seems like it would work the way you want.


Under Manage Display of the content type, add a Horizontal Tabs Group.
Then a Horizontal Tab Item for each field or section you want. The label you put in will be what shows up on the tab.
Nest the tabs underneath, and then put the fields you want underneath each tab.


The result will should look something like this. With a bit of CSS, you can make it look different.

Manage Display



Final Result