RE-populating Dynamic Drop-downs

[eluser]Sumon[/eluser]
Well, lets think, whats happen when you change first drop down. Call a function with this value and receive value(another list box).
okay now when validation failed then let us check select box appearance

Code:

if(isset($firstSelectBox))
{
  //call that url which generate another (region) list box.
}

now repeat this task for second select box as well.

Code:

if(isset($secondSelectBox))
{
  //load data/list box
}

For first load of the page these functions will not be called because there are no list/dropdown.

Hope form loaded with previous selected values.