_setdun(str, mode)
{
        local unitstr;

        if (argc < 2) mode = 1;

        switch (mode)
        {
                case 1:
                default:
                        unitstr = "VUNITS";
                        break;

                case 2:
                        unitstr = "HUNITS";
                        break;

                case 3:
                        unitstr = "ZUNITS";
                        break;
        }
        if (strlen(str) > 0)
        {
                if (strlen(strfind(" ", str)) > 0)
                {
                        if (strlen(strfind("'", str)) > 0)
                        {
                                str = sprintf('"%s"', str);
                        }
                        else
                        {
                                str = sprintf("'%s'", str);
                        }
                }
                setconf(unitstr, str);
        }
        else
        {
                setconf(unitstr, "");
        }
}