how do i get the contents of a drop down menu

how do i get the contents of a drop down menu into my script as a string. the contents of the menu are set by a separate script.

the menu is populated by a script that gets the names of all of the calendars in iCal. now i just need those names to to traspher to the first script so it can go in to

set newtodo to (make new todo at end of todos of calendar "CalName")