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;
}

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

  if (required && !validRequired(formField,fieldLabel))
    result = false;
  
   if (result)
   {
     var num = parseInt(formField.value);
     if (isNaN(num))
     {
      alert('Please enter a number 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 day = parseInt(elems[0],10);
        var month = parseInt(elems[1],10);
       var year = parseInt(elems[2],10);
      result = !isNaN(month) && (month > 0) && (month < 13) &&
            !isNaN(day) && (day > 0) && (day < 32) &&
            !isNaN(year) && (elems[2].length == 4);
     }
     
      if (!result)

     {
       alert('Please enter a date in the format DD/MM/YYYY for the "' + fieldLabel +'" field.');
      formField.focus();    
    }
  } 
  
  return result;
}

//===============================================================================
// Function assumes field already validated for date
function validAge(formField)
{
  var result = true;
  
  // Create date object using birth date str
  var birthDate = new Date(formField.value);
  
  // Create todays date
  var today = new Date();
  
  // getTime returns date in milliseconds, so need
  // to divide by number of milliseconds in year
  var age = (today.getTime() - birthDate.getTime())
        /(365*24*60*60*1000)


  if (age < 17 )
  {
     alert('You must be over 17 to get a quote.');
     result = false;
  }
  
  if (age > 80)
  {
  	alert('You must be under 80 to get a quote.');
	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 validateForm(theForm)
{
  // Customize these calls for your form

  // Start ------->
	if (!validRequired(theForm.name,"Name"))
    	return false;
	if(!validRequired(theForm.phonenum,"Phone Number"))
	    return false;
	if(!validPhoneNumber(theForm.phonenum,"Phone Number"))
	    return false;
	if (!validRequired(theForm.email,"Email"))
    	return false;
	if (!validRequired(theForm.address1,"Address Line 1"))
    	return false;		
	if (!validRequired(theForm.custpcode,"Your Postcode"))
    	return false;		
	if (!validEmail(theForm.email,"Email Address",true))
		return false;
	if(!validRequired(theForm.typeevent,"Type of Event"))
	    return false;		
	if (!validRequired(theForm.day,"Day"))
    	return false;
	if (!validRequired(theForm.month,"Month"))
    	return false;
	if (!validRequired(theForm.year,"Year"))
    	return false;
	if (!actualDate(theForm.day,theForm.month,theForm.year))
    	return false;		
	if (!validRequired(theForm.attendance,"Attendance"))
    	return false;		
	if (!validRequired(theForm.venue,"Venue Address"))
    	return false;
	if (!validRequired(theForm.venuepcode,"Venue Postcode"))
    	return false;
	if (!validRequired(theForm.referrer,"Where did you hear about us?"))
    	return false;
	if (!validRequired(theForm.area,"Area of UK"))
    	return false;		
  	
  // <--------- End
  
  return true;
}