gistfile1.js

// Check whether to do tricky layout
var classesForTrickyLayout = ['node-type-design', 'page-node-enquire', 'page-node-19', 'page-node-20', 'page-user'];
// Check against body classes
var doTrickyLayout = ( $( $('body').attr('class').split(/\s+/) ).filter(classesForTrickyLayout).length > 0 );

if ( doTrickyLayout ) {
  $('.fullscreen-background').appendTo($('#content-outer'));

  // Resize image
  var newWidth = $('#content-outer').width() - $('#content-inner').width();
  $(el).width(newWidth);

  // Vertical center
  var heightDifference = $('#content-outer').height() - $(el).height();
  $(el).css('top', Math.min(heightDifference / 2, 0));

  // Resize content area (has max and min height set in styles.css)
  $('#content-wrapper').height($(el).height() - 60);

  // Reinit scroll pane
  $('#content-wrapper').jScrollPane();

} else {
  // Regular fixed fullsize background
  $(this).expandTo($body);
}