function chiffres(event) {
// Compatibilité IE / Firefox
if(!event&&window.event) {
event=window.event;
}
// IE
if(event.keyCode < 48 || event.keyCode > 57) {
event.returnValue = false;
event.cancelBubble = true;
}
// DOM
if(event.which < 48 || event.which > 57) {
event.preventDefault();
event.stopPropagation();
}
}

function champVide(){
var inputList = document.forms['monFormulaire'].elements;
var alertTxt = "";
for (unInput in inputList){
    if(unInput.type=="text" && unInput.value.length==0){
alertTxt += "Le champ " + unInput.name + " n'a pas été rempli \n";
}
}
alert(alertTxt)
}