function valider(frm){
	var alertTxt = "";
	var okTxt = "Message envoye, merci";
	var problem = 0;
	for(var i=0;i<frm.length;++i){
	    if(frm.elements[i].type == "textarea" && frm.elements[i].value =="" || frm.elements[i].type == "text" && frm.elements[i].value.length == 0){
			alertTxt += "Le champ " + frm.elements[i].name + " n'a pas ete rempli \n";
			problem = 1;
		}
	}
	
	if(problem == 1){
		alert(alertTxt);
		return false;
	}else{
		alert(okTxt);
		return true;
	}	
}