Is there a click event or some event that can start an action after a user selects an item in a combo box.

I have an ASP that when it loads, the 1st combo box is populated with a list of equipment numbers.

The second combo box is populated with component items for the 1st equipment number in the recordset.

When some one selects a new equipment number I need the combo box to be repopulated and represent the components that are associate with that equipment number. I guess this will require a redirect. how do I do it? Please help!!!!