I have 3 SELECT drop down
SELECT 1
This is pretty much it. I'll work up an example.
$('#select1').change(function() {
$('#select2').val($('#select1').val());
$('#select3').val($('#select2').val());
});
Edit: The example: http://jsbin.com/ahema
And TStamper has a very good point, make sure you put in the ID, or it won't work. (you can see that in the example)