public function removeFilter($callback)
	{
		if (($index = array_search('Dwoo_Filter_'.$callback, $this->filters, true)) !== false) {
			unset($this->filters[$index]);
		} elseif (($index = array_search($callback, $this->filters, true)) !== false) {
			unset($this->filters[$index]);
		} else	{
			$class = 'Dwoo_Filter_' . $callback;
			foreach ($this->filters as $index=>$filter) {
				if (is_array($filter) && $filter[0] instanceof $class) {
					unset($this->filters[$index]);
					break;
				}
			}
		}
	}