Dyanmic drop down form ( Like Gmail's advance-email-search)

[hrishi321]

Hello All, Could anyone please help with suggesting the technique that I can follow to achieve the following. I need to create a drop down form/division.. just like gmail-advance-search-option, where the drop down form pops up on clicking on a link. Please note that my drop down division content is dynamic, ie must be sent by server dynamically (depending on a parameter which user selects previously). Detail/example: So lets say user selects the option X and click on the buton/link to collapse the drop-down form. At this time, we should receive the form (belongs to the option X) from the server and client should display it. On click on submit, some search should be perform. PHP is a must. Could you please let me know the technique to achieve the same..Ajax/Jquery sounded helpful to me . but i have almost 0 knowledge on them . . . . An example or link would be highly appreciated. Sorry if it sounds basic :) I am a new bee to web development. Thanks Hrishi