Array.prototype.getById = function(id){
	for(var i=0; i<this.length; ++i){
		if(this[i].id == id)
			return this[i];
	}
	return null;
}

epgs.isRootFolder = function(folderid){
	for(var i=0; i<this.length; ++i){
		if(folderid == this[i].root){
			return true;
		}
	}
	return false;
}