I am facing a problem with setInterval being used in a loop. I have a function subscribeFeed( ) which takes an array of urls as input. It loops through the url array and subscribes each url to getFeedAutomatically() using a setInterval function.

so if three URL's are there in the array, then 3 setInterval's will be called. The problem is 1)how to distinguish which setInterval is called for which URL. 2)it is causing Runtime exception in setInterval( i guess because of closure problem in javascript)

//constructor
function myfeed(){
    this.feedArray = [];
}

myfeed.prototype.constructor= myfeed;
myfeed.prototype.subscribeFeed =function(feedUrl){
      var i=0;
      var url;
      var count = 0;
      var _this = this;
  var feedInfo = {
                url : [],
        status : ""
    };
      var urlinfo = [];
      feedUrl = (feedUrl instanceof Array) ? feedUrl : [feedUrl];
     //notifyInterval = (notifyInterval instanceof Array) ? notifyInterval: [notifyInterval];

    for (i = 0; i < feedUrl.length; i++) {

        urlinfo[i] = {
                url:'',
                notifyInterval:5000,// Default Notify/Refresh interval for the feed 
                isenable:true,      // true allows the feed to be fetched from the URL
                timerID: null,      //default ID is null
                called : false,
                position : 0,
                getFeedAutomatically : function(url){
                    _this.getFeedUpdate(url);
                },
            };


            urlinfo[i].url  = feedUrl[i].URL;

            //overide the default notify interval 
            if(feedUrl[i].NotifyInterval /*&& (feedUrl[i] !=undefined)*/){
                urlinfo[i].notifyInterval = feedUrl[i].NotifyInterval;  
            }


        // Trigger the Feed registered event with the info about URL and status 
        feedInfo.url[i] = feedUrl[i].URL;  

        //Set the interval to get the feed.
        urlinfo[i].timerID = setInterval(function(){
                             urlinfo[i].getFeedAutomatically(urlinfo[i].url);
                        }, urlinfo[i].notifyInterval);

         this.feedArray.push(urlinfo[i]);

        }
    }
// The getFeedUpate function will make an Ajax request and coninue
  myfeed.prototype.getFeedUpdate = function( ){


  }

I am posting the same on jsfiddle http://jsfiddle.net/visibleinvisibly/S37Rj/

Thanking you in advance