function validateEmail(address)
{
  var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
  if(reg.test(address) == false)
    return false;
  return true;
}

function validatePhone(phone)
{
  var reg = /^[2-9]\d{2}-\d{3}-\d{4}$/;
  if(reg.test(phone) == false)
    return false;
  return true;
}

function checkCompForm()
{
  if(document.getElementById('contact_first_name').value == '')
  {
    alert('Please enter your first name.');
    document.getElementById('contact_first_name').select();
    return false;
  }
  if(document.getElementById('contact_last_name').value == '')
  {
    alert('Please enter your last name.');
    document.getElementById('contact_last_name').select();
    return false;
  }
  if(document.getElementById('contact_address').value == '')
  {
    alert('Please enter your address.');
    document.getElementById('contact_address').select();
    return false;
  }
  if(document.getElementById('contact_city').value == '')
  {
    alert('Please enter your city.');
    document.getElementById('contact_city').select();
    return false;
  }
  if(document.getElementById('contact_state').value == '')
  {
    alert('Please choose your state.');
    return false;
  }
  if(document.getElementById('contact_zip').value == '')
  {
    alert('Please enter your zip.');
    document.getElementById('contact_zip').select();
    return false;
  }
  if(document.getElementById('email_address').value == '')
  {
    alert('Please enter your email address.  If you don\'t have an email address, type "N/A"');
    document.getElementById('email_address').select();
    return false;
  }
  if(document.getElementById('phone_number').value == '')
  {
    alert('Please enter your phone number.');
    document.getElementById('phone_number').select();
    return false;
  }
  if(document.getElementById('contact_date_of_birth').value == '')
  {
    alert('Please enter your date of birth (mm/dd/yyyy).');
    document.getElementById('contact_date_of_birth').select();
    return false;
  }
  return true;
}

function checkGasForm()
{
  if(document.getElementById('first_name').value == '')
  {
    alert('Please enter your first name.');
    document.getElementById('first_name').select();
    return false;
  }
  if(document.getElementById('last_name').value == '')
  {
    alert('Please enter your last name.');
    document.getElementById('last_name').select();
    return false;
  }
  if(document.getElementById('address').value == '')
  {
    alert('Please enter your address.');
    document.getElementById('address').select();
    return false;
  }
  if(document.getElementById('city').value == '')
  {
    alert('Please enter your city.');
    document.getElementById('city').select();
    return false;
  }
  if(document.getElementById('state').value == '')
  {
    alert('Please choose your state.');
    return false;
  }
  if(document.getElementById('zip_code').value == '')
  {
    alert('Please enter your zip code.');
    document.getElementById('zip_code').select();
    return false;
  }
  if(validateEmail(document.getElementById('email_address').value) == false)
  {
    alert('Please enter a valid Email Address (ex. address@domain.com).');
    document.getElementById('email_address').select();
    return false;
  }
  if(validatePhone(document.getElementById('phone_number').value) == false)
  {
    alert('Please enter a valid Phone Number (ex. 555-555-5555).');
    document.getElementById('phone_number').select();
    return false;
  }
  if(!(document.getElementById('terms-conditions').checked))
  {
    alert('Please agree to the Terms & Conditions before entering the contest.');
    return false;
  }
  return true;
}

function checkCourseStep1()
{
  if(document.getElementById('contact_school').value == '')
  {
    alert('Please choose a school.');
    return false;
  }
  if(validateEmail(document.getElementById('email_address').value) == false)
  {
    alert('Please enter a valid Email Address (ex. address@domain.com).');
    document.getElementById('email_address').select();
    return false;
  }
  if(!(document.getElementById('valid-age').checked))
  {
    alert('Please confirm that you own a New York State Learner\'s Permit.');
    return false;
  }
  return true;
}

function checkCourseSignUp()
{
  if(document.getElementById('contact_first_name').value == '')
  {
    alert('Please enter your first name.');
    document.getElementById('contact_first_name').select();
    return false;
  }
  if(document.getElementById('contact_last_name').value == '')
  {
    alert('Please enter your last name.');
    document.getElementById('contact_last_name').select();
    return false;
  }
  if(document.getElementById('contact_address').value == '')
  {
    alert('Please enter your address.');
    document.getElementById('contact_address').select();
    return false;
  }
  if(document.getElementById('contact_city').value == '')
  {
    alert('Please enter your city.');
    document.getElementById('contact_city').select();
    return false;
  }
  if(document.getElementById('contact_state').value == '')
  {
    alert('Please choose your state.');
    return false;
  }
  if(document.getElementById('contact_zip_code').value == '')
  {
    alert('Please enter your zip code.');
    document.getElementById('contact_zip_code').select();
    return false;
  }
  if(validateEmail(document.getElementById('email_address').value) == false)
  {
    alert('Please enter a valid Email Address (ex. address@domain.com).');
    document.getElementById('email_address').select();
    return false;
  }
  if(validatePhone(document.getElementById('phone_number').value) == false)
  {
    alert('Please enter a valid Phone Number (ex. 555-555-5555).');
    document.getElementById('phone_number').select();
    return false;
  }
  return true;
}

function checkCourseTest()
{
  if(document.getElementById('tq_1-1').checked == false)
  {
    alert('Question #1 is incorrect, please try again.');
    return false;
  }
  if(document.getElementById('tq_2-0').checked == false)
  {
    alert('Question #2 is incorrect, please try again.');
    return false;
  }
  if(document.getElementById('tq_3-1').checked == false)
  {
    alert('Question #3 is incorrect, please try again.');
    return false;
  }
  if(document.getElementById('tq_4-3').checked == false)
  {
    alert('Question #4 is incorrect, please try again.');
    return false;
  }
  if(document.getElementById('tq_5-0').checked == false)
  {
    alert('Question #5 is incorrect, please try again.');
    return false;
  }
  var confirm_text = 'Congratulations, you have successfully answered all questions correctly.\n\nBy clicking "OK", your registration information will be recorded, and you will receive an email with details.  You MUST click the link in the email in order to activate your registration.\n\nIf you do not click the link, your spot in the course will still be open for others to register for.\n\nIf your spot is taken before you click the link, your information will still be saved, but you will need to pick a new date to register for.\n\nYou will NOT have to enter all your information again, just a new course date.\n\nThank you for signing up!';
  return confirm(confirm_text);
}

// To switch the thumbnail on the Google Checkout Page
function updateThumb(selected_option, img_div, item)
{
  var the_div = document.getElementById(img_div);
  the_div.innerHTML = '<img src="/images/' + item + 's/' + item + '_' + selected_option.className + '.jpg" alt="Martin, Harding, &amp; Mazzotti ' + item + '" />';
}