function isPosInteger(inputVal) {
    var inputStr = inputVal.toString();
    for (var i = 0; i < inputStr.length; i++) {
        var oneChar = inputStr.charAt(i);
        if ((i == 0) && (oneChar < "1" || oneChar > "9")) {
            return false
        }
        if ((oneChar < "0" || oneChar > "9") && (i > 0)) {
            return false
        }
    }
    return true
    
}

function checkQty(form, elemName, message) {
    for (var i = 0; i < document.getElementsByName(elemName).length; i++) {
        if (!isPosInteger(document.getElementsByName(elemName)[i].value)) {
            var elem = document.getElementsByName(elemName)[i];
            elem.focus();
            elem.select();
            alert(message);
            return false
        }
    }
    return true
}