function CheckEmpty(Field, FieldTitle)
{
	if (Field.value.replace(/\s/g,"") == "")
	{
		alert("请在\"" + FieldTitle + "\"一栏中输入内容！");
		Field.focus();
		return false;
	}
		
	return true;
}

function emptyLen(Field,MaxLength,FieldTitle)
{
	if (Field.value.replace(/\s/g,"") == "")
	{
		alert("请在\"" + FieldTitle + "\"一栏中输入内容！");
		Field.focus();
		return false;
	}
	else
	{
		if (Field.value.length > MaxLength)
		{
			alert("\"" + FieldTitle + "\"中输入的字符请不要超过" + MaxLength + "字符！");
			Field.focus();
			return false;
		}		
	}
		
	return true;
}

function CheckInteger(Field, FieldTitle)
{
	if (Field.value != "")
	{
		for (i = 0; i < Field.value.length; i++)
		{
			ch = Field.value.charAt(i);
				
			if (ch < '0' || ch > '9') {
				alert("\"" + FieldTitle + "\"中只能输入数字！");
				Field.focus();
				return	false;
			}
		}
	}
	
	return true;
}

function CheckDate(Field, FieldTitle)
{
	if (Field.value != "")
	{
		for (i = 0; i < Field.value.length; i++)
		{
			ch = Field.value.charAt(i);
			
			if ((ch < '0' || ch > '9') && ch != '-' ) {
				alert("\"" + FieldTitle + "\"中只能输入日期！");
				Field.focus();
				return	false;
			}
		}
	}
	
	return true;
}

function CheckPhone(Field, FieldTitle)
{
	if (Field.value != "")
	{
		for (i = 0; i < Field.value.length; i++)
		{
			ch = Field.value.charAt(i);
				
			if ( (ch < '0' || ch > '9') && ch != '-'  && ch != '(' && ch != ')' && ch != '_' ) {
				alert("\"" + FieldTitle + "\"中只能电话号码数字以及(、)、-、_符号！");
				Field.focus();
				return	false;
			}
		}
	}
		
	return true;
}

function CheckReal(Field, FieldTitle)
{
	if (Field.value != "")
	{
		DotNum = 0;
		for (i = 0; i < Field.value.length;  i++)
		{
			ch = Field.value.charAt(i);
				
			if ((ch < '0' || ch > '9') && ch != '.')
			{
				alert("\"" + FieldTitle + "\"中只能输入数字！");
				Field.focus();
				return false;
			}
				
			if (ch == '.')
			{   DotNum=DotNum+1;
				if (DotNum > 1)
				{
					alert("\"" + FieldTitle + "\"中只能输入一个小数点！");
					Field.focus();
					return false;
				}
			}
		}
	}
		
	return	true;
}

function CheckMoney(Field, FieldTitle)
{
	if (Field.value != "")
	{
		DotNum = 0;
		for (i = 0; i < Field.value.length;  i++)
		{
			ch = Field.value.charAt(i);
				
			if ((ch < '0' || ch > '9') && ch != '.' && ch != '-')
			{
				alert("\"" + FieldTitle + "\"中只能输入数字！");
				Field.focus();
				return false;
			}
				
			if (ch == '.')
			{   DotNum=DotNum+1;
				if (DotNum > 1)
				{
					alert("\"" + FieldTitle + "\"中只能输入一个小数点！");
					Field.focus();
					return false;
				}
			}
		}
	}
		
	return	true;
}

function CheckMaxLength(Field, MaxLength, FieldTitle)
{
	if (Field.value != "")
	{
		if (Field.value.length > MaxLength)
		{
			alert("\"" + FieldTitle + "\"中输入的字符请不要超过" + MaxLength + "字符！");
			Field.focus();
			return false;
		}
	}
			
	return true;
}
	
function CheckMinLength(Field, MinLength, FieldTitle)
{
	if (Field.value != "")
	{
		if (Field.value.length < MinLength)
		{
			alert("\"" + FieldTitle + "\"中输入的字符请不要少于" + MinLength + "字符！");
			Field.focus();
			return false;
		}
	}
			
	return true;
}
	
function CheckOption(Field, FieldTitle)
{
	for (i = 0; i < Field.length; i++)
		if (Field[i].checked)
			return true;
				
	alert("请选择\"" + FieldTitle + "\"中的值！");
	return false;
}
	//此函数用于判断Email地址是否正确
function CheckEmail(Field)
{
   // there must be >= 1 character before @, so we
   // start looking at character position 1
   // (i.e. second character)
   var i = 1;
   var len = Field.value.length;
	if (len > 50)
	{
		window.alert("email地址长度不能超过50位!");
		Field.focus();
		return false;
	}
	pos1 = Field.value.indexOf("@");
	pos2 = Field.value.indexOf(".");
	pos3 = Field.value.lastIndexOf("@");
	pos4 = Field.value.lastIndexOf(".");
	//check '@' and '.' is not first or last character
	if ((pos1 <= 0)||(pos1 == len-1)||(pos2 <= 0)||(pos2 == len-1))
	{
		window.alert("请输入有效的E-mail地址！");
		Field.focus();
		return false;
	}
	else
	{
		//check @. or .@
		if( (pos1 == pos2 - 1) || (pos1 == pos2 + 1)
		  || ( pos1 != pos3 )  //find two @
		  || ( pos4 < pos3 ) ) //. should behind the '@'  		
		{
			window.alert("请输入有效的E-mail地址！");
			Field.focus();
			return false;
		}
	}
	return true;
}
	
function CheckMustLength(Field, MustLength, FieldTitle)
{
	if (Field.value != "")
	{
		if (Field.value.length != MustLength)
		{
			alert("\"" + FieldTitle + "\"中输入的值必须是" + MustLength + "位！");
			Field.focus();
			return false;
		}
	}
			
	return true;
}
	
function CheckIntRange(field,prompt,min,max) {
	if ( ! CheckInteger(field,prompt) )
		return	false;
	ival = parseInt(field.value);
	if ( ival < min || ival > max ) {
		alert(prompt + " 只能为 " + min + " 到 " + max + " 之间的数");
		field.focus();
		return	false;
	}
	return	true;
}