The form data needs to be sent to the server as a post in order for the server to perform the lookup.
it would possible to set up an ajax function that would perform the form post on change of the checkbox, but not actually change the page, but that would require unsupported hand coding.
here is a page i found through google with more details on using ajax to send the form without actually submitting it:
submit-a-form-without-page-refresh-using-jquery/


