function fermer_alerte(){
	if (document.getElementById('alerte')){
	var alerte_a_fermer=document.getElementById("alerte");
	var Parent = alerte_a_fermer.parentNode;
	Parent.removeChild(alerte_a_fermer);
	}
}
function message_alert(balise,message){
	fermer_alerte();
	var balise_de_base=document.getElementById(balise);
	var crea_boite=document.createElement("div");
	crea_boite.id="alerte";
	crea_boite.appendChild(document.createTextNode(message));
	var crea_bouton=document.createElement("a");
	crea_bouton.setAttribute('href', 'javascript:fermer_alerte()');
	crea_bouton.id="btn_fermer";
	var crea_span=document.createElement("span");
	crea_span.setAttribute("class","txt_btn_commander");
	crea_span.setAttribute("className","txt_btn_commander");
	crea_span.appendChild(document.createTextNode("Fermer"));
	balise_de_base.appendChild(crea_boite);
	crea_boite.appendChild(crea_bouton);
	crea_bouton.appendChild(crea_span);
}