function remove_class($removeclass)
{
$class = $this->class;
$classes = preg_split('#\\s+#', $class);
$removeclass = is_array($removeclass) ? $removeclass : preg_split('#\\s+#', $removeclass);
$classes = array_diff($classes, $removeclass);
$classes = array_unique($classes);
$this->class = trim(implode(' ', $classes));
}