Drop Downs

Drop Downs

I made a drop down box with 3 choices to pick from. Each of the 3 choices has drop downs to choice from. I don't want to show the other 2 choice drop downs. Example

 This is under the drop down called Equipment. If I remove the 2nd IF statement. It works like it should.        


if ( (input.Equipment == input.Tractor) )
{
}
show Tractor;
if ( (input.Equipment == input.Harvester) )
{
}
show Harvester