var p_realname = "realname";
var p_cardname = "cardholdersname";
var p_phone = "TelNo";
var p_mobile = "MobNo";
var p_bestcontacttime = "BestTimeToContactYou";
var p_email = "EmailAddress";


// Is it a valid email address?
// Assume valid if got the @ 
// in it
function isEmailAddr(email)
{
	var result = false;
	var theStr = new String(email);
	var index = theStr.indexOf("@");
	if (index > 0)
	{
		var pindex = theStr.indexOf(".",index);
		if ((pindex > index+1) && (theStr.length > pindex+1))
		result = true;
	}
	return result;
}

// Return true if the required field is 
// not empty
function validRequired(formField,fieldLabel)
{
	var result = true;

	if (formField.value == "")
	{
		alert('Please enter a value for the "' + fieldLabel +'" field.');
		formField.focus();
		result = false;
	}
	return result;
}

// Make sure that a valid selection has been 
// made, one without an empty value
function validSelection(formField,fieldLabel,showAlert)
{
	var result = true;
	
	if (formField.value == "" )
	{
		if (showAlert) {
			alert('Please choose a value for the "' + fieldLabel +'" field.');
		}
		result = false;
	}

	return result;
}

// Returns true if there are all digits in the string
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;
}

// Checks to see if it is a valid email address
function validEmail(formField,fieldLabel,required)
{
	var result = true;

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

	if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	{
		alert("Please enter a complete email address in the form: yourname\@yourdomain.com");
		formField.focus();
		result = false;
	}
	return result;
}

// Checks to see if it is just a number with only digits in it
function validNum(formField,fieldLabel,required)
{
	var result = true;

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

	if (result)
	{
		if (!allDigits(formField.value))
		{
			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 

	return result;
}

// Checks to see if it is a valid positive integer
function validInt(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
	
	if (result)
	{
		var num = parseFloat(parseInt(formField.value));		
		var num2 = parseFloat(formField.value);
		if (isNaN(num2))
		{
			alert('Please enter a positive whole number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
		else if (isNaN(num))
		{
			alert('Please enter a positive whole number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
		else if (num != num2) {
			alert('Please enter a positive whole number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}					
	} 

	return result;
}

function intInBound(formField, fieldLabel, required, min, max){
	var result = false;
	result = validInt(formField, fieldLabel, required); 
	if (result){
		var num = parseInt(formField.value);
		if (num < min){
			alert('Please enter a whole number of at least '+min+' for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}	
		else if (num > max){
			alert('Please enter a whole number no more than '+max+' for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	}
	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('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();		
		}
	} 

	return result;
}

function elementExistsInForm(theForm, elementName){
	var theElements = theForm.elements;
	for(var j = 0; j < theElements.length; j++) {
		if (theElements[j].name == elementName){
			return true;
		}
	}
	return false;
}

function validateForm(theForm)
{	

	if (!validSelection(eval("theForm."+p_realname),"Name",true))
	return false;

	if (!validSelection(eval("theForm."+p_phone),"Telephone Number",false) && !validSelection(eval("theForm."+p_mobile),"Mobile Number",false))
	{	
		if (!validSelection(eval("theForm."+p_phone),"Telephone or Mobile Number",true))
		return false;		
	}
	
	
	if (!validSelection(eval("theForm."+p_bestcontacttime ),"Best Time To Contact You",true))
	return false;


	if (!validEmail(eval("theForm."+p_email ),"Email Address",true))
	return false;
	
	return true;
}