var search_form_init=0;

function valider_search(){
  var test_form=true;
  var message_form="";
  search_form_init=0;
  $('alert_search').setStyles('visibility: hidden;');
  if($('search').getValue()=="") {
  test_form=false;
  search_form_init=1;
  }
      
  if(test_form==false) {
  $('alert_search').setHTML('Champ vide !');
  var instance = new Fx.Styles($('alert_search'), {duration: 200});
  instance.custom({'opacity': [0,1]});
  }
  else {
  $('form_search').submit();
  }
}

function init_search() {
  if (search_form_init==1) {
  var instance = new Fx.Styles($('alert_search'), {duration: 200});
  instance.custom({'opacity': [1,0]});  
  }
}