function sql_in_set($field, $array)
	{
		if (!sizeof($array))
		{
			trigger_error('No values specified for SQL IN comparison', E_USER_ERROR);
		}

		$bitfield = (strpos($field, 'bitfield') !== false)

		$values = array();
		foreach ($array as $var)
		{
			if (is_null($var))
			{
				$values[] = 'NULL';
			}
			else if (is_string($var))
			{
				if (!$bitfield)
				{
					$values[] = "'" . $this->sql_escape($var) . "'";
				}
				else
				{
					$values[] = $this->sql_escape_binary($var);
				}
			}
			else
			{
				$values[] = (is_bool($var)) ? intval($var) : $var;
			}
		}

		if (sizeof($values) == 1)
		{
			return $field . ' = ' . $values[0];
		}
		else
		{
			return $field . ' IN (' . implode(',', $values) . ')'
		}
	}