e.");
            return null;
        }
        if (isNegative(canonicalFrom)) {
            alert("You must specify a positive value for the low " +
                   "end of the request number range.");
            return null;
        }
        crit[next++] = "(requestId>=" + canonicalFrom + ")";
    }

    if (document.requestNumberRangeCritForm.requestTo.value != "") {
        canonicalTo =
            trim(document.requestNumberRangeCritForm.requestTo.value);
    }

    if (canonicalTo != "") {
    