function became_fan(id_artist){
	var tab_pars=new Array();
	//id de l artiste dont on devient fan
	tab_pars.push("id_artist=" + id_artist);

	//envoi de la requete ajax
	var pars = encodeURI(tab_pars.join('&'));
	var myAjax = new Ajax.Request('/common_rfa/became_fan.php', {method: 'post',postBody: pars, onSuccess: became_fan_success, onFailure: became_fan_failure} );
}
function became_fan_success(request){
	location.reload();
}
function became_fan_failure(request){
	alert("Problème de traitement de la requète.")
}