function validation() 
{  
		
		if(document.formulaire.nom.value == "") 
		{ 
        alert ('Please entrer your name'); 
        document.formulaire.nom.focus(); 
        return false; 
    	}
		
		var email = document.formulaire.email.value; 
        if (email.search(/^[^._-][a-z0-9._-]+[^._-]@[a-z0-9._-]+([a-z0-9]+[^._-])?[.-]+[a-z]{2,4}$/) == -1)
        { 
        alert ('Please enter a valid mail adress'); 
        document.formulaire.email.focus(); 
        return false; 
        }
		
		if(document.formulaire.telephone.value == "") 
		{ 
        alert ('Please enter your phone number'); 
        document.formulaire.telephone1.focus(); 
        return false; 
    	}
				 
else {return true;}
}