You're talking about recordsets, so I'm guessing you're pulling this info from a database? So the column1 values are put into a dropdown box and then based on what is selected, you want the DB to populate a second drop down? Are the values from column1 from the DB too, or just the second drop down?
If this isn't pulling from a DB, you should then refer to this topic in the JS forum:
http://codingforums.com/showthread.php?t=67806
-Shane