adventureForm = document.querySelector('#adventure');
       charterDrop = document.querySelector('.charter-options');
       mountainDrop = document.querySelector('.mountain-lake-options');
       trampDrop = document.querySelector('.tramp-options');
       photoDrop = document.querySelector('.photo-options');
       dropDowns =  document.querySelector('#dropdowns');

      // check adventure dropdown choice
      if (field.id === "adventure" && adventureForm.selectedIndex === 0) {
      dropDowns.classList.add('hidden');

          } else if (field.id === "adventure" && adventureForm.selectedIndex === 1)  {
              dropDowns.classList.remove('hidden');
             charterDrop.classList.remove('hidden');
           mountainDrop.classList.add('hidden');
           trampDrop.classList.add('hidden');
           photoDrop.classList.add('hidden');
         } else if (field.id === "adventure" && adventureForm.selectedIndex === 2)  {
           dropDowns.classList.remove('hidden');
           charterDrop.classList.add('hidden');
           mountainDrop.classList.remove('hidden');
           trampDrop.classList.add('hidden');
           photoDrop.classList.add('hidden');
         } else if (field.id === "adventure" && adventureForm.selectedIndex === 3)  {
           dropDowns.classList.remove('hidden');
           charterDrop.classList.add('hidden');
           mountainDrop.classList.add('hidden');
           trampDrop.classList.remove('hidden');
           photoDrop.classList.add('hidden');
         } else
if (field.id === "adventure" && adventureForm.selectedIndex === 4)  {
           dropDowns.classList.remove('hidden');
           charterDrop.classList.add('hidden');
           mountainDrop.classList.add('hidden');
           trampDrop.classList.add('hidden');
           photoDrop.classList.remove('hidden');
         }