Capture iPad device change (IOS7) tested.

gistfile1.txt

//capture ipad device change (IOS7) tested.
function doOnOrientationChange()
{
    // alert(window.orientation);
    switch(window.orientation)
    {
      case 0:
      case 90:
        // alert('portrait');
        $('html').removeClass('landscape').addClass('portrait');
        break;
      case -90:
        // alert('landscape');
        $('html').removeClass('portrait').addClass('landscape');
        break;
      default:
        break;
    }
}