function rotaterail(siteid,railtype,mode) {
                if (siteid != null && railtype != null){
                var ranNum= Math.round(Math.random()* 0);
                }
                else
                {
                }
                return '<script src="http://railads.scrippsing.com/' + siteid + '/' + railtype + '/' + mode + '/rail_' + ranNum + '.js"></script>';
                }