[jQuery] using multiple triggers with ajax

[shaded]

i have 5 multiple select boxes each of which get populated when the
previous box is clicked on. ex. i select a value from box 1 that
populates box 2 then i select box 2 that populates box 3 etc.

is it possible to have them all populate with out the clicking.
ex. i click in box 1 and box 2, gets populated, box 3 get populated
based on the new box 2 value etc.

I'm using Shelane's plugin:
http://code.google.com/p/jqueryselectcombo/
http://lasso.pro/selectCombo/

here is he code that calls the plugin

$(function(){
        $('#ddl_market').selectCombo('url?setval=true', '#ddl_zone',
{hidetarget: false} );
        $('#ddl_zone').selectCombo('url?setval=true', '#ddl_customer',
{hidetarget: false} );
        $('#ddl_customer').selectCombo('url?setval=true', '#ddl_group',
{hidetarget: false} );
        $('#ddl_group').selectCombo('url?setval=true', '#ddl_store',
{hidetarget: false} );
});

they are all ajax calls the entire page does not reload.