function isEmailAddr(email)
{
  	var result = true;
  	var strEmail = new String(email);
  	var intAPosition = strEmail.indexOf("@");
  	var intDotPosition = strEmail.lastIndexOf(".");
  	var intLastPosition = strEmail.length-1;

  	if (intAPosition<1 || intDotPosition-intAPosition<2 || intLastPosition-intDotPosition>4 || intLastPosition-intDotPosition<2)
  	{
    		result = false;
  	}

	return result;
}

function validRequired(formField,fieldLabel)
{
	var result = true;

	if (formField.value == "")
	{
		alert('\u8bf7\u5728\u201c' + fieldLabel +'\u201d\u680f\u5185\u8f93\u5165\u4e00\u4e2a\u503c\u3002');
		formField.focus();
		result = false;
	}

	return result;
}

function validRequiredFilled(formField,titleString,fieldLabel)
{
	var result = true;

	if (formField.value == "" || formField.value == titleString)
	{
		alert('\u8bf7\u5728\u201c' + fieldLabel +'\u201d\u680f\u5185\u8f93\u5165\u4e00\u4e2a\u503c\u3002');
		formField.focus();
		result = false;
	}

	return result;
}

function validMatch(formField1,formField2,fieldLabel1,fieldLabel2,required)
{
	var result = true;

	if (required && !validRequired(formField1,fieldLabel1))
		result = false;

	if (formField1.value != formField2.value)
	{
		alert('\u201c' + fieldLabel1 + '\u201d\u548c\u201c' + fieldLabel2 + '\u201d\u680f\u5fc5\u987b\u76f8\u5339\u914d');
		formField2.focus();
		result = false;
	}

  	return result;
}

function radioSelected(formField,fieldLabel)
{
	var result = true;
	var count = -1;
	var i;

	for(i=0; i<formField.length; i++)
	{
		if (formField[i].checked)
			count = i;
	}

	if (count == -1)
	{
		alert('\u8bf7\u4e3a\u201c' + fieldLabel + '".');
		result = false;
	}

	return result;
}

function checkboxSelected(formField,fieldLabel)
{
	var result = true;

	if (!formField.checked)
	{
		alert('\u8bf7\u9009\u62e9\u201c' + fieldLabel + '".');
		result = false;
	}

	return result;
}

function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}

	return result;
}


function validEmail(formField,fieldLabel,required)
{
	//var result = true;

	if (required)
	{
		if (!validRequired(formField,fieldLabel))
		{
			result = false;
		}
		else
		{
			result = "test";
		}
	}
	else
	{
		if (formField.value != "")
		{
			result = "test"
		}
		else
		{
			result = true;
		}
	}

	if (result == "test")
	{
		if (!isEmailAddr(formField.value))
		{
			alert("Please enter a complete email address in the form: yourname@yourdomain.com");
			formField.focus();
			result = false;
		}		
	}

  	return result;
}

function validInt(formField,fieldLabel,required)
{
	if (required)
	{
		if (!validRequired(formField,fieldLabel))
		{
			result = false;
		}
		else
		{
			result = "test";
		}
	}
	else
	{
		if (formField.value != "")
		{
			result = "test";
		}
		else
		{
			result = true;
		}
	}

 	if (result == "test")
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('\u8bf7\u5728\u201c' + fieldLabel +'\u201d\u680f\u5185\u8f93\u5165\u4e00\u4e2a\u6570\u5b57\u3002');
			formField.focus();
			result = false;
		}
	}

	return result;
}


function validNum(formField,fieldLabel,required)
{
	if (required)
	{
		if (!validRequired(formField,fieldLabel))
		{
			result = false;
		}
		else
		{
			result = "test";
		}
	}
	else
	{
		if (formField.value != "")
		{
			result = "test";
		}
		else
		{
			result = true;
		}
	}

 	if (result == "test")
 	{
		if (!inValidCharSet(formField.value,"0123456789."))
		{
			alert('\u8bf7\u5728\u201c' + fieldLabel +'\u201d\u680f\u5185\u8f93\u5165\u4e00\u4e2a\u6570\u5b57\u3002');
			formField.focus();
			result = false;
		}
		else
		{
			result = true;
		}
	}

	return result;
}


function validDate(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{
 		var elems = formField.value.split("/");

 		result = (elems.length == 3); // should be three components

 		if (result)
 		{
 			var month = parseInt(elems[0]);
			var day = parseInt(elems[1]);
 			var year = parseInt(elems[2]);
			result = allDigits(elems[0]) && (month > 0) && (month < 13) &&
					 allDigits(elems[1]) && (day > 0) && (day < 32) &&
					 allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
 		}

  		if (!result)
 		{
 			alert('\u8bf7\u4ee5\u6708\u6708/\u65e5\u65e5/\u5e74\u5e74\u5e74\u5e74\u7684\u683c\u5f0f\u5728\u201c' + fieldLabel +'\u201d\u680f\u4e2d\u8f93\u5165\u65e5\u671f\u3002');
			formField.focus();
		}
	}

	return result;
}

function validPhone(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{
 		var elems = formField.value.split("-");

 		result = (elems.length == 3); // should be three components

 		if (result)
 		{
 			var areacode = parseInt(elems[0]);
			var prefix = parseInt(elems[1]);
 			var sufix = parseInt(elems[2]);
			result = allDigits(elems[0]) && (elems[0].length == 3) &&
					 allDigits(elems[1]) && (elems[1].length == 3) &&
					 allDigits(elems[2]) && (elems[2].length == 4);
 		}

  		if (!result)
 		{
 			alert('\u8bf7\u4ee5XXX-XXX-XXXX \u7684\u683c\u5f0f\u5728\u201c' + fieldLabel +'\u201d\u680f\u5185\u8f93\u5165\u7535\u8bdd\u53f7\u7801\u3002');
			formField.focus();
		}
	}

	return result;
}

function dropdownSelected(formField,fieldLabel)
{
	var result = true;

	if(formField.selectedIndex==0)
	{
		alert('\u8bf7\u4e3a\u201c' + fieldLabel + '".');
		formField.focus();
		result = false;
	}

	return result;
}


function validOther(formField1,otherlocation,formField2,fieldLabel)
{
	var result = true;

	if(formField1.selectedIndex == otherlocation)
	{
		if (formField2.value == "")
		{
			alert('\u8bf7\u5728\u201c' + fieldLabel +'\u201d\u680f\u5185\u8f93\u5165\u4e00\u4e2a\u503c\u3002');
			formField2.focus();
			result = false;
		}
	}

	return result;
}

function validRefferals(formField,fieldLabel)
{
	if (!inValidCharSet(formField.value,"0123456789, "))
	{
		alert('\u5176\u4e2d\u53ea\u80fd\u5305\u542b\u6570\u5b57\u548c\u9017\u70b9');
		formField.focus();
		result = false;
	}
	else
	{
		result = true;
	}
	
	return result;
}