function _CF_onError(form_object, input_object, object_value, obj_type, error_message) {
	alert(error_message);
	if (obj_type == "TEXT" || obj_type == "PASSWORD") {
		input_object.focus();
		input_object.select();
	}
	return false;	
}

function _validEmail(str) {
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(str))
		return true;
	else
		return false;
}

function _CF_hasValue(obj, obj_type) {
	if (obj_type == "TEXT" || obj_type == "PASSWORD") {
  	if (obj.value.length == 0) 
    	return false;
    else 
    	return true;
  }
  else if (obj_type == "SELECT") {
  	for (i=1; i < obj.length; i++) {
			// modified 6/3/05 for RMA form
			 if (obj.options[i].selected)
			//if (obj.selectedIndex == i)
				return true;
			//	break;
		}
   	return false;
	}
  else if (obj_type == "SINGLE_VALUE_RADIO" || obj_type == "SINGLE_VALUE_CHECKBOX") {
		if (obj.checked)
			return true;
		else
    	return false;	
	}
  else if (obj_type == "RADIO" || obj_type == "CHECKBOX") {
		for (i=0; i < obj.length; i++) {
			if (obj[i].checked)
				return true;
		}
		return false;	
	}
}

function _CF_checkinteger(object_value)
    {
    //Returns true if value is a number or is NULL
    //otherwise returns false	

    if (object_value.length == 0)
        return true;

    //Returns true if value is an integer defined as
    //   having an optional leading + or -.
    //   otherwise containing only the characters 0-9.
	var decimal_format = ".";
	var check_char;

    //The first character can be + -  blank or a digit.
	check_char = object_value.indexOf(decimal_format)
    //Was it a decimal?
    if (check_char < 1)
	return _CF_checknumber(object_value);
    else
	return false;
    }


function _CF_numberrange(object_value, min_value, max_value)
    {
    // check minimum
    if (min_value != null)
	{
        if (object_value < min_value)
		return false;
	}

    // check maximum
    if (max_value != null)
	{
	if (object_value > max_value)
		return false;
	}
	
    //All tests passed, so...
    return true;
    }



function _CF_checknumber(object_value)
    {
    //Returns true if value is a number or is NULL
    //otherwise returns false	

    if (object_value.length == 0)
        return true;

    //Returns true if value is a number defined as
    //   having an optional leading + or -.
    //   having at most 1 decimal point.
    //   otherwise containing only the characters 0-9.
	var start_format = " .+-0123456789";
	var number_format = " .0123456789";
	var check_char;
	var decimal = false;
	var trailing_blank = false;
	var digits = false;

    //The first character can be + - .  blank or a digit.
	check_char = start_format.indexOf(object_value.charAt(0))
    //Was it a decimal?
	if (check_char == 1)
	    decimal = true;
	else if (check_char < 1)
		return false;
        
	//Remaining characters can be only . or a digit, but only one decimal.
	for (var i = 1; i < object_value.length; i++)
	{
		check_char = number_format.indexOf(object_value.charAt(i))
		if (check_char < 0)
			return false;
		else if (check_char == 1)
		{
			if (decimal)		// Second decimal.
				return false;
			else
				decimal = true;
		}
		else if (check_char == 0)
		{
			if (decimal || digits)	
				trailing_blank = true;
        // ignore leading blanks

		}
	        else if (trailing_blank)
			return false;
		else
			digits = true;
	}	
    //All tests passed, so...
    return true
    }



function _CF_checkrange(object_value, min_value, max_value)
    {
    //if value is in range then return true else return false

    if (object_value.length == 0)
        return true;


    if (!_CF_checknumber(object_value))
	{
	return false;
	}
    else
	{
	return (_CF_numberrange((eval(object_value)), min_value, max_value));
	}
	
    //All tests passed, so...
    return true;
    }




function _CF_checkzip(object_value)
    {
    if (object_value.length == 0)
        return true;
		
    if (object_value.length != 5 && object_value.length != 10)
        return false;

	// make sure first 5 digits are a valid integer
	if (object_value.charAt(0) == "-" || object_value.charAt(0) == "+")
        return false;

	if (!_CF_checkinteger(object_value.substring(0,5)))
		return false;

	if (object_value.length == 5)
		return true;
	
	// make sure

	// check if separator is either a'-' or ' '
	if (object_value.charAt(5) != "-" && object_value.charAt(5) != " ")
        return false;

	// check if last 4 digits are a valid integer
	if (object_value.charAt(6) == "-" || object_value.charAt(6) == "+")
        return false;

	return (_CF_checkinteger(object_value.substring(6,10)));
    }



function _CF_checkcreditcard(object_value)
    {
	var white_space = " -";
	var creditcard_string="";
	var check_char;


    if (object_value.length == 0)
        return true;

	// squish out the white space
	for (var i = 0; i < object_value.length; i++)
	{
		check_char = white_space.indexOf(object_value.charAt(i))
		if (check_char < 0)
			creditcard_string += object_value.substring(i, (i + 1));
	}	

	// if all white space return error
    if (creditcard_string.length == 0)
        return false;
	 
	 	
	// make sure number is a valid integer
	if (creditcard_string.charAt(0) == "+")
        return false;

	if (!_CF_checkinteger(creditcard_string))
		return false;

    // now check mod10

	var doubledigit = creditcard_string.length % 2 == 1 ? false : true;
	var checkdigit = 0;
	var tempdigit;

	for (var i = 0; i < creditcard_string.length; i++)
	{
		tempdigit = eval(creditcard_string.charAt(i))

		if (doubledigit)
		{
			tempdigit *= 2;
			checkdigit += (tempdigit % 10);

			if ((tempdigit / 10) >= 1.0)
			{
				checkdigit++;
			}

			doubledigit = false;
		}
		else
		{
			checkdigit += tempdigit;
			doubledigit = true;
		}
	}	
	return (checkdigit % 10) == 0 ? true : false;

    }


function  _checkForm_Contact(_CF_this) {
	if (!_CF_hasValue(_CF_this.SenderName, "TEXT" )) {
  	if (!_CF_onError(_CF_this, _CF_this.SenderName, _CF_this.SenderName.value, "TEXT", "Your name is required")) {
    	return false; 
    }
  }
	if (!_CF_hasValue(_CF_this.Email, "TEXT" )) {
  	if (!_CF_onError(_CF_this, _CF_this.Email, _CF_this.Email.value, "TEXT", "E-mail address is required")) {
    	return false; 
    }
  }
  if  (!_validEmail(_CF_this.Email.value)) {
  	if  (!_CF_onError(_CF_this, _CF_this.Email, _CF_this.Email.value, "TEXT", "Please enter a valid e-mail address")) {
    	return false; 
		}
  }
	if (!_CF_hasValue(_CF_this.Subject, "TEXT" )) {
  	if (!_CF_onError(_CF_this, _CF_this.Subject, _CF_this.Subject.value, "TEXT", "Message subject is required")) {
    	return false; 
    }
  }
	if (!_CF_hasValue(_CF_this.Comments, "TEXT" )) {
  	if (!_CF_onError(_CF_this, _CF_this.Comments, _CF_this.Comments.value, "TEXT", "Please enter your comments / questions")) {
    	return false; 
    }
  }
  return true;
}