live search results

[Aman05]

Hi guys

im trying use a live search on my website, and iv found a code on the following link:

http://www.w3schools.com/php/php_ajax_rss_reader.asp

i understand it all but need to tweak it to suit my needs. What i need for it to do is search multiple drop down requests, for example:

1. first name
2. last name

I want it to search by what has been selected (it is not necesary that all fields need to be selected, default will be any), however in the html it states:

xmlhttp.open("GET","getrss.php?q="+str,true);

and it only shows 1 option, i would like it to show multiple records. and once the records are shown, I would like the option of amending the search result any time in the search.

please help