function changeListe(form,tous)
{
 var choix = form.elements['region'].options[form.elements['region'].selectedIndex].value;	
 var dep = form.elements['departement'];
 dep.options.length = 0;
 dep.options[dep.options.length] = new Option(tous,"0");
 for (var i=0;i<TabDepNom.length;i++) 
 {
  if ( TabDepReg[i] == choix || choix == 0 )
  {
   dep.options[dep.options.length] = new Option(TabDepNom[i],TabDepID[i]);
  }
 }
}