drupal template.php js

/**
 * Sets the body-tag class attribute.
 *
 * Adds 'sidebar-left', 'sidebar-right' or 'sidebars' classes as needed.
 */
function phptemplate_body_class($left, $right) {
  if ($left != '' && $right != '') {
    $class = 'sidebars';
  }
  else {
    if ($left != '') {
      $class = 'sidebar-left';
    }
    if ($right != '') {
      $class = 'sidebar-right';
    }
  }

  if (isset($class)) {
    print ' class="'. $class .'"';
  }
}