function new_window (url, window_target)
	{
	var window_popup = window.open(url,window_target,"toolbar=yes,location=yes,directories=yes,status=yes,menubar=yes,scrollbars=yes,resizable=yes,favorites=yes");
	window_popup.focus();
	}

function close_window ()
	{
	window.close();
	}

function back_window ()
	{
	history.back();
	}