Ajax.Request data handling

Hey everyone,
I cant figure out how to retrieve a value sent via Ajax.Request
function in prototype. for example I have a function like so:

function send(event) {
new Ajax.Request(
<?php echo "'". $html->url(array(
"controller" => "users",
"action" => "add")) . "'";?>
,{
parameters: event.memo,
onComplete: function(xhr) {
// optional callback
}
});
}
Which calls the users/add function. How do i retrieve the event.memo
data in my controller function?
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