If these lists are not too long, you would be better off generting a few hidden tags on your form and use pure JavaScript to pull values from the hidden tags to populate your second list. So say your values lists are as follows:
1st List Entry Values for second list
AAAAA 11111,22222,33333,44444
BBBBB 11111,33333,66666,77777
CCCCC 55555,66666,88888,99999
then you would create 5 hidden tags with the name AAAAA and each one would contain one of the corresponding values. The same for BBBBB and CCCCC.
Then in java script using an onSelect call, you would then populate the second list using the values "hidden" under the same name as the selected value. As long as the lists are not too large, this would be a very good way to solve your problem.
If you still wish to use AJAX, then I would suggest you find some AJAX tutorial sites and get at least a general idea of how AJAX works and how you program it. Then try to do this, and if you have a any specific questions on how to continue find an AJAX and/or JavaScript forum site to ask these questions.
Java Programmer and Sun Systems Administrator
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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
