JWplayer. Change destination source with HTTP request

I got the jwplayer source code from github . I want to change some scripts and build a player. So, I need to change the file source from javascript to flash. In javascript, I set some "host" and "flv_id" parameters:

jwplayer("mediaplayer").setup({
    autostart: false,
    controlbar: "none",
    displayclick: "none",
    smoothing: true,
    stretching: "exactfit",
    icons: false,
    flashplayer: "/jwplayer.swf",
    file: "/videos/3aae1ef41d.flv",
    flv_id: "115554",
    host: "<?php echo $host; ?>",
    provider: "http",
    startparam: "start",
    height: 400,
    width: 650,
    events: {
        onComplete: function() {
        },
        onPause: function(event) {
        },
        onError: function() {
        }
    }
});

      

        
        
        
      

    

In flash, I have a class that can make a post-request:

var post:Post = new Post("http://"+someparameters["host"]+"/video/flv");
post.variables.id = someparameters["flv_id"];
post.Send(Go);

      

        
        
        
      

    

Go is a success callback function that returns some flvlink.

Go(link:String):void { 
      //link - is source, that i need to play 
}

      

        
        
        
      

    

The player plays "/videos/3aae1ef41d.flv". But I want to play source from Go (); I have a Mail class, but I don't know where to paste my code. Now I don't have any changes to the default source code. I don't know which player source file to edit. So, I need to know how can I use my "Post" class to play video from a Go function.