le traitement de formulaire

<?php
$nom = $_POST["nom"];
$prenom = $_POST["prenom"];
$adresse = $_POST["adresse"];
$ville = $_POST["ville"];
$telephone = $_POST["telephone"];
$mail = $_POST["email"];
$msg = $_POST["mesage"];
$contentmsg = "Nom: \n".$nom."Prenom:\n"$prenom."\nAdresse:\n".$adresse."Ville:\n".$ville."\nEmail: ".$mail."\nTelephone :".$telephone."\nSujet: ".$sjt."\nMessage: \n".$msg;



//Variables pour les mails
$subjectrecep = "Merci de votre message!";
$contentrecep = "Vous venez d'utiliser mon formulaire de contact et il marche parfaitement! Votre message a été envoyé. Merci!";

// Mail configuration
$to="alizee.baud@hotmail.fr"; //votre adresse mail
$subject=""formulaire contact site_mbe"";

$headers .= "From: ".$mail."\n";
$headers2 .= "From: ".$to."\n";

//envoi des mails
mail($to,$sjt,$contentmsg,$headers);
mail($mail,$subjectrecep,$contentrecep,$headers2);

?>

txt_message.text = " ";
// reset du champ texte erreur si un champs du formulaire est modifié

txt_nom.onChanged=txt_email.onChanged=txt_ville.onChanged=txt_telephone.onChanged=txt_prenom.onChanged=txt_adresse.onChanged=txt_message.onChanged=function () {
	txt_erreur.text = " ";
};
// lorsqu'on clique dans le champ texte "nom", on vide le champ texte

txt_adresse1.onSetFocus = function() {
	if (txt_adresse1.text == " ") {
		txt_adresse1.text = "";
		mc_adresse1._alpha = 50;
	}

};
txt_adresse1.onKillFocus = function() {
	if (txt_adresse1.text == "") {
		txt_adresse1.text = " ";
		mc_adresse1._alpha = 100;
	}
};
txt_nom.onSetFocus = function() {
	if (txt_nom.text == " ") {
		txt_nom.text = "";
		mc_nom._alpha = 50;
	}

};
txt_nom.onKillFocus = function() {
	if (txt_nom.text == "") {
		txt_nom.text = " ";
		mc_nom._alpha = 100;
	}
};
txt_prenom.onSetFocus = function() {
	if (txt_prenom.text == " ") {
		txt_prenom.text = "";
		mc_prenom._alpha = 50;
	}

};
txt_prenom.onKillFocus = function() {
	if (txt_prenom.text == "") {
		txt_prenom.text = " ";
		mc_prenom._alpha = 100;
	}
};
txt_email.onSetFocus = function() {
	if (txt_email.text == " ") {
		txt_email.text = "";
		mc_email._alpha = 50;
	}

};
txt_email.onKillFocus = function() {
	if (txt_email.text == "") {
		txt_email.text = " ";
		mc_email._alpha = 100;
	}
};

txt_ville.onSetFocus = function() {
	if (txt_ville.text == " ") {
		txt_ville.text = "";
		mc_ville._alpha = 50;
	}

};
txt_ville.onKillFocus = function() {
	if (txt_ville.text == "") {
		txt_ville.text = " ";
		mc_ville._alpha = 100;
	}
};

txt_message.onSetFocus = function() {
	if (txt_message.text == " ") {
		txt_message.text = "";
		mc_message._alpha = 50;
	}

};
txt_message.onKillFocus = function() {
	if (txt_message.text == "") {
		txt_message.text = " ";
		mc_message._alpha = 100;
	}
};
txt_telephone.onSetFocus = function() {
	if (txt_telephone.text == " ") {
		txt_telephone.text = "";
		mc_telephone._alpha = 50;
	}

};
txt_telephone.onKillFocus = function() {
	if (txt_telephone.text == "") {
		txt_telephone.text = " ";
		mc_telephone._alpha = 100;
	}
};

// code bouton ENVOIE
bouton_envoie.onPress = function() {
	this._alpha=50;
}
bouton_envoie.onRelease = function(){
	this._alpha = 100;
}
// code bouton clear
bouton_clear.onPress = function() {
	this._alpha=50;
	vider();
}
bouton_clear.onRelease = function(){
	this._alpha = 100;
}
//fonction pour vider les champs texte

function vider() {
	txt_nom.text = " ";
	txt_telephone.text = " ";
	txt_email.text = " ";
	txt_message.text = " ";
	txt_prenom.text = " ";
	txt_ville.text = " ";
	txt_adresse1.text = " ";
	mc_adresse1._alpha = 100;
	mc_telephone._alpha = 100;
	mc_ville._alpha = 100;
	mc_prenom._alpha = 100;
	mc_nom._alpha = 100;
	mc_email._alpha = 100;
	mc_message._alpha = 100;
}
bouton_envoie.onPress = function() {
	var senddata = new LoadVars();
	// si aucun champ n'a été rempli
	if (( txt_nom.text == " ") or ( txt_prenom.text == " ")or ( txt_adresse1.text == " ") or ( txt_telephone.text == " ")or ( txt_ville.text == " ") or (txt_email.text == " ") or (txt_message.text == " ")) {
		erreur("merci de remplir tous les champs");
		bouton_envoie._alpha = 50;
	}
	else {
		senddata.nom = txt_nom.text;
		senddata.prenom = txt_prenom.text;
		senddata.ville = txt_ville.text;
		senddata.telephone = txt_telephone.text;
		senddata.adresse1 = txt_adresse1.text;
		senddata.email = txt_email.text;
		senddata.mesage = txt_message.text;
		senddata.sendAndLoad( "traitement.php", senddata, "POST") ;
		vider();
		erreur("Message envoyé");
		bouton_envoie._alpha = 50;
	
		}
}
function erreur (txt){
	txt_erreur.text = txt;
}