function control() 
{ 
if (document.DISPO.nom.value.length == 0) 
{ 
alert("Please fill in all fields marked by *! "); 
return false; 
} 
if (document.DISPO.prenom.value.length == 0) 
{ 
alert("Please your first name"); 
return false; 
} 
if (document.DISPO.email.value.length == 0) 
{ 
alert("Please your e-mail"); 
return false; 
} 
return true; 
}