call seperate website rpc with ajax

I currently have a ajax system working locally. Now i want to expand it so that people can call the rpc.php file on my website, and get information returned to theirs.

What do i need to change to do this? I tried chmodding the rpc.php file to give all permissions, that didnt work.

here is the call code

var http = createRequestObject();

function sndReq(action) {
    http.open('get', 'http://www.globalsurance.com/rpc.php?action='+action);
    http.onreadystatechange = handleResponse;
    http.send(null);
}

Code (markup):

everything works to get to this location, and works after handle response. The response just isnt coming.

The reponse should come as a echo statement like this echo

echo "div|response to action";

PHP:

the java interprets this and places the info after the | into the divid named before the |.

 

You can only call a server with AJAX if it's the server the HTML file is on.

It can be a real pain...

Edit: I think that's what you want to do anyway. What you can is give them a PHP file to put on their own server, to communicate with yours. The only other way is to use some weird Flash hacks: http://blog.monstuff.com/archives/000280.html