AJAX Multiple Select dropdowns

AJAX Multiple Select dropdowns

I'm looking for a jQuery AJAX plugin that allows me to do the following. I have three dropdowns ( Make, Model, Year), the values of the second and third dropdowns need to dynamically changed based on the selection of the previous dropdown.

Example:
Dropdown 1
Dropdown 2 ( would change depending on selection in dropdown 1 )
Dropdown 3 ( would change depending on selection in dropdown 2 )

Is there an existing plugin that works? or can anyone lead me in the right direction?

Thanks,