addLoadListener(init);

function init()
{
  document.forms[0].onsubmit = validateFields;

  return true;
}

function validateFields()
{

var elements = document.forms["contactForm"].elements;
  var emailPattern = /^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$/;

  for (var i = 0; i < elements.length; i++)
  {
    if (/(^| )checkRequired( |$)/.test(elements[i].className) && elements[i].value == "")
    {
      elements[i].focus();
      alert("Please complete the field indicated.");
      return false;
    }

    if (/(^| )checkEmail( |$)/.test(elements[i].className) && !emailPattern.test(elements[i].value))
    {
      elements[i].focus();
      alert("You must provide a valid e-mail address.");
      return false;
    } 
	 }
	

	 if (document.forms["contactForm"].elements["check_upload"].value =="Yes" && document.forms["contactForm"].elements["filename"].value == "")
 {
	 alert("Please upload your exercise to music file,\n or select 'No' if you do not wish to upload now.");
	 return false;
 } 

if (document.forms["contactForm"].elements["check_upload"].value =="No" && document.forms["contactForm"].elements["filename"].value != "")
 {
	 document.forms["contactForm"].elements["check_upload"].value ="Yes";
	 
	 return true;
 } 
  return true;
   
}


function addLoadListener(fn)
{
  if (typeof window.addEventListener != 'undefined')
  {
    window.addEventListener('load', fn, false);
  }
  else if (typeof document.addEventListener != 'undefined')
  {
    document.addEventListener('load', fn, false);
  }
  else if (typeof window.attachEvent != 'undefined')
  {
    window.attachEvent('onload', fn);
  }
  else
  {
    var oldfn = window.onload;
    if (typeof window.onload != 'function')
    {
      window.onload = fn;
    }
    else
    {
      window.onload = function()
      {
        oldfn();
        fn();
      };
    }
  }
}