populate taxonomy from another taxonomy I have 2 exposed filters in a search page "drop down lists", I want to populate the second exposed filer "taxonomy" from the first one:

example 
vehicle {car, plane, ship}
and the second should be {BMW, Honda, etc} 
only if vehicle car is selected in the first drop down list.
thanks
Found the solution for this, I used Hierarchical Select
and it worked like a charm.