Question

Will a javascript library like Prototype/Scriptaculous or jQuery help me create a dynamic form on a webpage where I can show a different set of checkboxes based on the value chosen in a combobox?

Answer 1

Yes, because all these libraries (frameworks) help make easy the cross-browser fiddling with the DOM..

Something along the lines of (in jQuery)

$(document).ready( //when the DOM is loaded invoke the following function
function(){
 $('combobox_selector').change( // when someone changes the value of the combobox invoke the following function
     function(){
                 $('some_checkbox_selector').hide(); // hide some checkboxes..
                 $('some_other_checkbox_selector').show(); // show some other checkboxes..
               }
  )
}
);

The selector parts of the code above should be replaced by the logic that determines which items gets hidden and which shown when the value of the combobox changes..