Implementing countries and states drop down

I sent this message two days ago but it was never posted? Could someone include an example of two dropdown list boxes in a more simplified format so that others could study it? This example by Abhi is too specific for me to see the 'forest through the trees'. I think we all must do something similar at times such as category - subcategory or month - day or country - state at times. I would be grateful if anyone has performed this TWO contingent select boxes, or perhaps someone would find this as substance for a good blog? Thank you, Kathleen