var myajax;
var myid;
Event.observe(window,"load",cmusic,false);


function cmusic() {
     myid = Math.random();
     myajax = new Ajax.PeriodicalUpdater(   
         "music",   
         "/data/play.php",   
         {   
             method: "get",   
             parameters: "p="+myid,
             frequency: 3,
             onSuccess: function(request) {
                 myajax.options.parameters["ajax_request_id"] = Math.random();
                 myid = Math.random();
             },
             onComplete: function(request) {
             },
             onFailure: function(request) {
             },
             onException: function (request) {
             }
         }
     );
}