function checkEmpty(aControlName, aTipMsg) {
	var aObj = document.forms[0].elements[aControlName];
	if (aObj.value == "") {
		alert(aTipMsg + "����Ϊ�գ�");
		aObj.focus();
		return false;
	}
	return true;
}
function checkRadioCheckboxEmpty(aControlName, aTipMsg) {
	var aObj = document.getElementsByName(aControlName);
	var count = aObj.length;
	var aEmpty = true;
	for (i = 0; i < count; i++) {
		if (aObj[i].checked == true) {
			aEmpty = false;
			break;
		}
	}
	if (aEmpty == true) {
		alert(aTipMsg + "����Ϊ�գ�");
		aObj[0].focus();
		return false;
	}
	return true;
}
function checkReferenceEmpty(aControlName, aTipMsg) {
	var aObj = document.forms[0].elements[aControlName];
	if (aObj.value == "") {
		alert(aTipMsg + "����Ϊ�գ�");
		return false;
	}
	return true;
}
function checkRegx(aControlName, aTipMsg, aRegexValue) {
	var aObj = document.forms[0].elements[aControlName];
	if (aObj.value == "")
		return true;
	var regex = new RegExp(aRegexValue);
	if (!regex.test(aObj.value)) {
		alert(aTipMsg + "��ʽ����ȷ��");
		aObj.focus();
		return false;
	}
	return true;
}
function isNumeric(aControlName, aTipMsg, aRegexValue) {
	var aObj = document.forms[0].elements[aControlName];
	if (aObj.value == "")
		return true;
	var regex = new RegExp(aRegexValue);
	if (!regex.test(aObj.value)) {
		alert(aTipMsg + "������ֵ��");
		aObj.focus();
		return false;
	}
	return true;
}
function checkRange(aControlName, aTipMsg, maxValue, minValue) {
	var aObj = document.forms[0].elements[aControlName];
	if (aObj.value == "")
		return true;
	var aCompareValue = parseFloat(aObj.value);
	if (maxValue != "" && aCompareValue > maxValue) {
		alert(aTipMsg + "���ܴ��� " + maxValue + " ��");
		aObj.focus();
		return false;
	}
	if (minValue != "" && aCompareValue < minValue) {
		alert(aTipMsg + "������ " + minValue + " ��");
		aObj.focus();
		return false;
	}
	return true;
}
function checkMaxLength(aControlName, aTipMsg, maxLength) {
	var aObj = document.forms[0].elements[aControlName];
	if (aObj.value.length > maxLength) {
		alert(aTipMsg + "��ݳ��Ȳ��ܴ��� " + maxLength + " λ��");
		aObj.focus();
		return false;
	}
	return true;
}
function validateAll(aControlName, aTipMsg, dataType, theMaxLength,
		theScaleSize) {

	if (dataType == "number") {

		if (isNumeric(aControlName, aTipMsg, "^(-|\\+)?\\d+(\\.\\d+)?$"))
			return true;
		else {
			document.forms[0].elements[aControlName].focus;
			return false;
		}
	} else if (dataType == "string") {

		if (checkMaxLength(aControlName, aTipMsg, theMaxLength))
			return true;
		else {
			document.forms[0].elements[aControlName].focus;
			return false;
		}
	}
	return true;
}