function swapClass(obj, cls) {
  obj.className = cls
}

function displayWindow(url, width, height) {
 var Win = window.open(url,"displayWindow",'width=' + width + ',height=' + height + ',scrollbars=yes,menubar=no,channelmode=0,dependant=1,fullscreen=0,resizable=no,toolbar=no,status=0,location=0,directories=0');
}