Help needed in dealing with URL - php

Question

I am developing an app using twitter API,in which any user can enter his twitter username in textbox and get his followers. On home.php , I am using jquery. on click event of button, I am calling getinfo.php and passing textbox value along with it. This is the case so far.
What I want to do?
Right now my url is:
http://www.example.com this redirects to
http://www.example.com/home.php
Now I wish that my URL should also work like this:
http://www.example.com/username
means when user will type sitename and his username he should get his results.
As I am trying jquery first time, I am not getting how can I pass value of URL (username in this case) to getinfo.php directly?
or any other solution?
Can you guys help me with this? please ask for any details.
Your help will be greatly appreciated.
Thank you in advance.
Here is a posted code on demand
the click event in jquery:
$(document).ready(function(){
$("#btonsubmit").bind('click', function(){
$.get('/getinfo.php?tnm='+$('#tnm').val(), '', function(data){
$('#get_data').html(data);
});
}
)};
// here tnm is name of textbox. and btonsubmit for button

Answer 1

You can do this like below.
step 1: update your .htaccess file . add one line
ErrorDocument 404 /notfound.php
This will redirect your user to /notfound.php
step 2:
on notfound.php,
get any how URL that user has called like http://yoursite.com/username
below line might help you to get that URL, not sure...
$url = $_SERVER['HTTP_REFERRER'];
extract username from this url.
check whether this userName exist?
if exist process getInfo.php with that
username..
else redirect to notfound.html..
I am not sure as this will work or not?? the main Question is whether you will get URL with $_SERVER['HTTP_REFERRER'];