Live vs online (using javascript)

Well, if you’re willing to use jQuery you could easily do something along the lines of:

$.ajax({
  url: 'https://api.twitch.tv/kraken/streams/normalice',
  dataType: 'jsonp',
  type: 'get',
  success: function(data) {
    if(typeof data.stream === 'object') {
      document.getelementbyID('frame1').style.width = '160px';
    } else {
      document.getelementbyID('frame1').style.width = '0px';
    }
  }
});