star rating system implementation using PROTOTYPE + AJAX.

I'm trying to use the starbox star rating system in my page.
As the tutorial on the website suggested I used the saveStar function
to call a function in one of my controllers. the controller name is
comments and the function name is addRate.

the code I have below doesnt work because it is not accessing the
comments controller. how do i fix this?

function saveStar(event) {
new Ajax.Request('comments/addRate', {
parameters: event.memo,
onComplete: function(xhr) {
// optional callback
}
});
}

Also, how do i retrieve the data (event.memo) that is being send to
the addRate function? should i use the $this->param['forum']['memo'] ?
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