function verifiertout(form)
{
	if (verifierchamps(form) && verifieremail(form.email) )
	{
		return true ;
	}
	else
	{
		return false ;
	}
}

  
function verifierchamps(form) 
{ 
	if (form.nom.value.length == 0 || form.email.value.length == 0)  
 	{ 
 		alert ("Renseignez tous les champs svp!") ;
 		return false; 
 	} 
 	else 
 	{ 
 		return true; 
 	} 
}

  function verifieremail(email)
{
	if ((email.value.indexOf("@")>=0)&&(email.value.indexOf(".")>=0)) 
	{
		return true ;
	} 
		else 
	{
		alert("Email invalide !");
		return false  ;
	} 
}