cookie listener for changes

cookielistener.js

function cookieListener(cookieName, callback) {
    this.cookiename = cookieName;
    this.callback = callback;
    this.cookieRegistry = [];
    this.interval = setInterval(this.observe, 100);
}
cookieListener.prototype.CREATED = 'created';
cookieListener.prototype.DELETED = 'deleted';
cookieListener.prototype.UPDATED = 'updated';
cookieListener.prototype.observe = function() {
    var cookieVal = $.cookie(cookieName),
        status = null;
    if (this.cookieRegistry[this.cookieName] == null && cookieVal != null) {
        status = cookieListener.prototype.CREATED
    }else if(this.cookieRegistry[cookieName] != null && cookieVal == null){
        status = cookieListener.prototype.DELETED
    }else if(cookieVal  != this.cookieRegistry[cookieName]){
        status = cookieListener.prototype.UPDATED                
    }
    this.cookieRegistry[this.cookieName] = cookieVal; 
    if(status)this.callback(status);
    return status;
} 
cookieListener.prototype.removeListener = function(){
    clearInterval(this.interval)
}

// bind the listener

var cl = new cookieListener('foo', function(status) {
    if(status == cookieListener.prototype.DELETED = 'deleted')
        alert('oh no')!
});

Did you ever find a solution that doesn't involve setInterval?
This has issues for two reasons;

1. It's endless, and creates unnecessary computations and load
2. It will average a 50ms lag, which given most will need to act swiftly on the response, maybe prohibitive to use