function checkFormAndSend()
{
	var firstname = document.getElementById("firstname").value,
		lastname = document.getElementById("lastname").value,
		email = document.getElementById("email").value;
	
	var errors = 0;
	var errorMessage = "Merci de remplir les champs:"
	
	if ( firstname.length == 0 )
	{
		errors++;
		errorMessage += "\n - Prénom";
	}
	
	if ( lastname.length == 0 )
	{
		errors++;
		errorMessage += "\n - Nom";
	}
	
	if ( email.length == 0 )
	{
		errors++;
		errorMessage += "\n - E-mail";
	}
	
	if ( errors > 0 )
	{
		alert ( errorMessage );
	}
	else
	{
		submitForm();
	}
	
}

function submitForm()
{
	var form = document.getElementById("contactForm");
	
	form.submit();
}