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;
}
/*---------------------------------------------------------------*/
function emailChar(email)
{
  var result = true;
  var validchars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";

	for (var i=0; i < email.length; i++) 
	{
    	var letter = email.charAt(i).toLowerCase();
	    if (validchars.indexOf(letter) != -1)		
	      continue;		
		result = false;
	    break;
  	}	

  return result;
}
//-----------------------------------------------
function validPhoneNumber(formField,fieldLabel,required)
{
  var result = true;
  var thestring = formField.value;  
//  var thenum = parseInt(formField.value);
  var digit = thestring.substring(0,2);
  
  if (required && !validRequired(formField,fieldLabel))
    result = false;
  
   if (result)
   {	    
	  
	  var validchars = "0123456789 ";
	  
	for (var i=0; i < thestring.length; i++) 
	{
    	var letter = thestring.charAt(i).toLowerCase();
	    if (validchars.indexOf(letter) != -1)		
	      continue;		
		  alert ('Phone numbers can only contain numbers');
		  formField.focus();
		result = false;
	    break;
  	}	
	  
	  if(thestring.length < 10)
	  {
		  alert("That number is too short");
		  formField.focus(); 
		  result = false;
	  }
		  
	  else if (thestring.charAt(0)!= '0')
	  {
	      alert('The phone number must begin with a 0');
	      formField.focus();    
    	  result = false;
	  }
	  
	  else if(digit != '01' && digit != '02' && digit != '07' && digit != '08' && digit != '09')
	  {
	  	  alert('UK phone numbers cannot begin with those digits');
	      formField.focus();    
    	  result = false;
	  }
	  
  }   
  return result;
}
//===============================================================================

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;
}

//===============================================================================
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 an email address in the form: yourname@yourdomain.com");
    formField.focus();
    result = false;
  }
  
	else if (result && ((formField.value.length < 3) || !emailChar(formField.value)) )
	{
		alert('That email address contains invalid characters.');
		formField.focus();
		result = false;
	}
   
  return result;
}

//===============================================================================
//Checks whether a date can actually exist. 
function actualDate(formDay, formMonth, formYear)
{
	var day   = formDay.value; 			//Getting values from form
	var month = formMonth.value;
	var year  = formYear.value;	
	var result = true;					//variable to return telling whether the date is valid or not. 
	var daycheck = 0;					//initalise day variable

	var d=new Date();	
	var monthcheck = d.getMonth()+1;	//+1 because javascript dates start from 0, we're starting from 1
										//Deciding how many days are in the chosen month	
	if ( month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
		daycheck = 31;
	else if(month == 4 || month == 6 || month == 9 || month == 11)
		daycheck = 30;	
	else							//month is feb
	{
		var leapyear = year%4;	//Checking for leap year with mod function. Returns the remainder of division. If 0 then IS leap year.
		
		if (leapyear == 0)			//Is leap year therefore Feb = 29 days
			daycheck = 29;
		else						//Is NOT a leap year and feb = 28 days
			daycheck = 28;		
	}
	
	if (day > daycheck)				//If users says there are more days then there are, reject the date
	{
		alert('That date is not possible');
		formDay.focus();
		result = false;
	}
	
	return result;
}	

function activate_submit()
{
	if(document.lbBO.tscs.checked == true)
		document.lbBO.Submit.disabled = false;
	else		
		document.lbBO.Submit.disabled = true;	
	
}

//===============================================================================
function validateForm(theForm)
{
  // Customize these calls for your form

  // Start ------->
	if (!validRequired(theForm.postcodeid,"Collection Post Code"))
    	return false;
	if (!validRequired(theForm.postcodeid_destination,"Destination Post Code"))
    	return false;
		
	if (!validRequired(theForm.name,"Name"))
    	return false;
	if (!validRequired(theForm.postcode,"Post Code"))
    	return false;				
	if (!validRequired(theForm.town,"Town"))
    	return false;						
	if (!validRequired(theForm.collectiondate,"Collection Date"))
    	return false;	
	if (!validRequired(theForm.email,"Email"))
    	return false;
	if (!validEmail(theForm.email,"Email Address",true))
		return false;
	if(!validRequired(theForm.phonenum,"Phone Number"))
	    return false;
	if(!validPhoneNumber(theForm.phonenum,"Phone Number"))
	    return false;
	if(!validRequired(theForm.mobilenum,"Mobile Number"))
	    return false;
	if(!validPhoneNumber(theForm.mobilenum,"Mobile Number"))
	    return false;
	if(!validRequired(theForm.surprise,"Is it a surprise?"))
	    return false;			
	if (!validRequired(theForm.referrerid,"Where did you hear about us?"))
    	return false;
		
	if(theForm.tscs.checked != true)
	{
	 	alert("You must agree to our terms and conditions to get a limo quote..");
		return false;	
	}
  	
  // <--------- End
  
  return true;
}