function addFile(idinput)
{
  var id = parseInt(idinput.substr(7, 1));
  if(id <= 5)
  {     
    var  nxt = 'contrat'+(id+1);
    var  value = document.getElementById(idinput).value;

    if(id == 1)
    {
      newdiv = document.createElement('div');
      newdiv.setAttribute("id","listbox"); 
      newdiv.setAttribute("class","clean-gray");
      newdiv.innerHTML = value+"<br>";
      document.getElementById('listfichier').appendChild(newdiv); 
    }
    else
    {
      var get = document.getElementById('listbox');
      value = get.innerHTML+value;
      
      document.getElementById('listbox').innerHTML = value+"<br>";
    }
    document.getElementById(idinput).style.display='none';
    if(id < 5)
    {
      document.getElementById(nxt).style.display='inline';
    }
  }
}