function chkallData(form) {
	if (form.userId.value == "") {
        alert("Please input user id!");
        return;
	}
    if (form.userId.value.length < 4) {
        alert( "The User ID can not be less than 4 characters.");
        return;
    }
    if (form.password.value == "") {
        alert("Please input password!");
        return;
    }
    if (form.password.value.length < 6) {
        alert("The Password can not be less than 6 characters.");
        return;
    }
	if (isIllegalString(form.userId.value)) {
        alert("The User ID contains illegal characters!");
        return;
	}
    form.userId.value = form.userId.value.toUpperCase();

    form.submit();
}

function clrData(form) {
	form.userId.value = "";
    form.password.value = "";
}