function getId(id){
return document.getElementById(id);
}

function survol(element){
getId(element).style.backgroundPosition='0px 15px';
}

function sortie(element){
getId(element).style.backgroundPosition='0px 0px';
}

function popup(page) {
  var top=(screen.height-550)/2;
  var left=(screen.width-450)/2;
  window.open(page,"infos","top="+top+",left="+left+",width=450,height=550,menubar=no,scrollbars=no,statusbar=no");
}

function submitreser(){
compte=0;

verimail = getId('email').value;
var place = verimail.indexOf("@",1);
var point = verimail.indexOf(".",place+1);
if ((place < -1)||(verimail.length <2)||(point < 1))
{
compte++;
}


if(!getId('nuits').value){compte++;}
if(!getId('personnes').value){compte++;}
if(!getId('nom').value){compte++;}
if(!getId('prenom').value){compte++;}
if(!getId('tel').value){compte++;}
if(!getId('heure').value){compte++;}

if(compte==0){getId('reserform').submit();}else{alert("Attention!\nVeuillez remplir l'ensemble des champs\nafin d'envoyer ce formulaire!"+compte);}
}