function sendMail() {
  var name = document.mailForm.name.value;
  var email = document.mailForm.email.value;
  var website = document.mailForm.website.value;
  var subject = document.mailForm.subject.value;
  var message = document.mailForm.message.value;
  
  // check if fields have valid values
  var validFields = 0;
  
  if(name=="") {
	  validFields = 0;
	  alert('Please enter your name');
	  return;
  }
  else if (email=="") {
	  validFields = 0;
	  alert('Please enter your email address');
	  return;
  }
  else if (subject=="") {
	  validFields = 0;
	  alert('Please pass along a subject of the message');
	  return;
  }
  else if (message=="") {
	  validFields = 0;
	  alert('Hey, if you want to sent a message then do not forget to write one ;)');
	  return;
  }
  
  if(email!="") {
	if ( (email.indexOf('.') > 2) && (email.indexOf('@') > 0) ) {
	  validFields = 1;
  	}
  	else {
	  validFields = 0;
	  alert('The email address is not valid!');
	  return;
  	}
  }
  
  if(validFields==1) {
	  document.mailForm.submit();
  }
}