function chro() {
var chro1= new Date(); var t = Math.floor((chro1.getTime()-chro0.getTime())/1000);

if (t < t0) {
document.chrono.timer0.value=""+t+"";
timer = setTimeout("chro()", 1000);
}

if (t >= t0) {
for (var i=0; i<=n; i++) {
document.mots.elements[i].readOnly=true;
}

document.chrono.timer0.value=""+t0+"";
document.mots.submit();
clearTimeout(timer); timer = setTimeout("document.mots.submit()", 5000);
document.mots.alert0.value="validation automatique toutes les 5 secondes veuillez patienter"; 			 
}
}