function ctrl_mai_clt(){
	if(document.getElementById('txt_mai_clt').value.toLowerCase()== "votre email"){
	document.getElementById('txt_mai_clt').value = "";
	}
}

function ctrl_clt(){
	if ((document.forme_news.txt_mai_clt.value == "") || (document.forme_news.txt_mai_clt.value == "Votre email")){	
		window.alert("Veuillez saisir Votre email");
		document.forme_news.txt_mai_clt.focus();
		return false;
	}
	else{
		adresse = document.forme_news.txt_mai_clt.value;
		var place = adresse.indexOf("@",1);
		var point = adresse.indexOf(".",place+1);
		if ((place > -1)&&(adresse.length > 2)&&(point > 1)){}
		else{
			alert('Veuillez saisir un mail valide');
			document.forme_news.txt_mai_clt.focus();
			return false;
		}
	}
}