you can also use Flex AJAX Framework 1.0 .. http://hellospring.net/kharbat/Flex.rar

so easy ;)

example:

var ajax = new Flex.AJAX();
ajax.request('page.php', myFunction);

function myFunction(data){
alert(data);
}

" Designing with Web Standards" by Jeffrey Zeldman
http://www.amazon.com/Designing-Web-Standards-Jeffrey-Zeldman/dp/0735712018