Dynamically updaing JSP Form

Dear All,
In the following situation your help is highly appreciated.
A form contains various select fields. Depending on users login first <select> is populated. When user selets any value in the first <select>, second <select> is populated. And third <select> is populated based on second <select>. All these values are dynamic i.e. coming from DB. I dont' want to submit the form every time user selects value. Is there any way using javascript I can handle this.
Thanking you all in anticipation.
kind regards,
Vinay

Sure, you could load up the page with all the possible values in Javascript variables, and when various select options are selected, use Javascript to modify the options of the other select elements.
However, this entails you uploading all the possible values with every page load. This may not be practical.
If you need to go back to the server for the data, but don't want the page to refresh, one trick could be to post the server hits to an invisible iframe whose response can contain Javascript that can modify the select elements as appropriate.
hth,
bear