calling on a complex function with onClick (ajax) - php

Question

So I have this chunk of code here (below). It waits for a video to finish playing and then it looks up a cookie, sends that info to a php script through ajax, gets back a url from json, and reloads an iframe with a new url.
So I think you'll agree, it's sorta a lot going on.
Its purpose is to advance ONE forward in a playlist of videos. I am trying to create a button area where a user can click a >> sort of button and go forward. Which is exactly what this function does.
Rather than starting from scratch with a new function, is there a way to activate all of the above function functionality (ajax and all) when the user clicks that button?
<script>
function ready(player_id)
{
$f('play').addEvent('ready', function()
{
$f('play').addEvent('finish', onFinish);
});
function onFinish(play)
{
var now_video_var = $.cookie('now_video');
console.log ('player ' + now_video_var + ' has left the building');
var intermediate_integer = parseInt(now_video_var);
var request2 = $.ajax({
url : "geturl.php",
data : {intermediate_integer : intermediate_integer},
type : 'post'
}).done(function(data) {
var gotfrom = jQuery.parseJSON(data);
var NEWURL = gotfrom[1] ;
console.log(gotfrom);
console.log(data);
console.log(gotfrom[1]);
var theiframeforrealyo = document.getElementById('play');
$(theiframeforrealyo).attr("src", "http://player.vimeo.com/video/" + gotfrom[1] +"?api=1&player_id=play&title=0&byline=0&portrait=0&autoplay=1");
var new_video_var = intermediate_integer +1;
$.cookie('now_video', new_video_var);
console.log ( 'cookie function ok: the cookie is....');
console.log ($.cookie('now_video'));
});
}
}
window.addEventListener('load', function() {
//Attach the ready event to the iframe
$f(document.getElementById('play')).addEvent('ready', ready);
});
</script>