Combo box and variables

Hi, really stuck on this - hope I explain it ok.

I have a map masked to show a small area.
In combox1 you pick eg: carparks
combox2 appears and you can select the particular carpark eg :adelphi

When you select (eg) adelphi I want the map to move to particular co-ordinates.

There will other categories in combox1 as well which is where my current solution has broken. The elements in the lists are formed as arrays and not in the data/labels bit of the combobox - do i need to specify the coordinates in the array and then some how have a button to extract them and move the map ?

Can anybody help please ?

Thanks v. much

(will post a fla when i can)