dynamically updating a combo box

[Anon]

I am using php and mysql.
I have two combo boxes. One lists the tables in a database.The other one lists fields in a table. I have developed functions to do the above. The trouble is, I want to update dynamically the contents of the second combo box depending on what I chose in the first combo box. I have an idea that javascript should be able to do this, but so far this is not very clear.
Any help will be appreciated.

[khaine]

You will have use javascript to submit the form. The way to do it with javascript is to set the onchange for the combo box. Then set up a small script to submit the form.