Urgent - Beginner question

Is it possible to populate the second combo box dynamically without having to completely rebuild the page through a submit by choosing a value ion the first combo box?
We are looking at moving our sevlets into a JSP environment. We are currently generating our HTML out of these servlets.
We have a number of combo boxes etc that are populated dynamically.
For example selecting the a value from the first combo box which is a list of months of the year will give me a second combo box with the number of days in that month.
I do not want to store all the information on the client and use Javascript as this will make the pages too big.
So is it possible to populate the second combo box dynamically without having to completely rebuild the page through a submit?
How it would be good to work is that the user clicks a button which call a piece of JavaScript which is a function that calls all the setter properties of a bean and finally calls a public method to update the page. I can see that this may not be possible as we are trying to generate the connection to the database from the client browser.
I have also heards of a method where you can update sections of the HTML page. Any ideas on this.
All help GREATLY appreciated.
Owen
null

You have several options:
1. (This is the old way to do it) Make a non-visible applet on the page and have your JavaScript ask the applet to do the submit. The Applet submits to your servlet which generates the data, concetenates it into a String, and sends it back as "text/plain". The Applet then sends the String back to the JavaScript which parses it and constructs the next combo. Downside - you have to fire up the JVM in the browser, which can be slow.
2. Put the second combo in an IFRAME and have JavaScript to a submit when the first combo is changed. The submit target is the IFRAME and the content returned is the second combo. Downside - wierd formatting for IFRAME, need to submit the overall page using JavaScript (since the two combos are now in different forms).
3. Make a hidden IFRAME on the page and do the submit there. When the page refreshes, have it call a JavaScript in the parent page setting the properties of the second combo. Downside - if the IFRAME is really hidden I think you have to sign the page, also some browsers don't really hide the IFRAME so you have to be carefull about formatting.
HTH
John H.

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VICE_PRESIDENT                     DAYS_5    DAYS_10    DAYS_20    DAYS_30    DAYS_40
Fedele Mark                                                          35473      35209
Fedele Mark                                                          35479      35258
Schultz Christine                              35700
South John                                                                      35253
Stack Kevin                                    35701      35604      35402      35115
Stack Kevin                                    35705      35635      35415      35156
Stack Kevin                                    35706      35642      35472      35295
Stack Kevin                                    35707      35666      35477
Stack Kevin                                               35667      35480
Stack Kevin                                               35686
Unknown                             35817      35698      35596      35363      35006
Unknown                                        35702      35597      35365      35149
Unknown                                        35724      35599      35370      35155
Unknown                                                   35600      35413      35344
Unknown                                                   35601      35451      35345
Unknown                                                   35602      35467
Unknown                                                   35603      35468
Unknown                                                   35607      35475
Unknown                                                   35643      35508
Unknown                                                   35644
Unknown                                                   35669
Unknown                                                   35684
Walmsley Brian                                 35725      35598
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