function twist() {
var cible = document.getElementById("cible").value;
var depart = document.getElementById("depart").value;
document.getElementById("cible").value = depart;
document.getElementById("depart").value = cible;
}

function pmoins() {
document.getElementById("maxdeep").value = Math.max(0  ,parseInt(document.getElementById("maxdeep").value)-1);
}

function pplus() {
document.getElementById("maxdeep").value = Math.min(100,parseInt(document.getElementById("maxdeep").value)+1);
}