I am not sure what you're trying to accomplish
Do you have multiple linked listboxes? E.g. list two changes when you select a value from list 1?
If so, are you doing this server side or client side? On the server you can look at the value for list one and then determine the items for list two, while at the same time, preselecting the item in list one again.
You can do the same with client side code, using the FAQ I linked you to.
Or re you trying to create entirely new option elements in the second drop-down? In that case, search Google for JavaScript and "new option". You'll find articles similar to this one:
http://www.quirksmode.org/js/options.html
HtH,
Imar
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Imar Spaanjaars
Everyone is unique, except for me.