window.onload = function(){

  if ($('id_recherche_field')){
    
    $('id_recherche_field').onfocus = function (evt){
      $('id_recherche_field').value='';
    }
  }

  if ($('id_select_zones_principales')){
  
    choixZone(
      $('id_select_zones_principales').
        options[$('id_select_zones_principales').selectedIndex].
        value
    );      
  
    $('id_select_zones_principales').onchange = select_zones_principales_onchange;
    $('1_id_select_zones').onchange = select_zones_onchange;
    $('2_id_select_zones').onchange = select_zones_onchange;
    $('3_id_select_zones').onchange = select_zones_onchange;
    $('4_id_select_zones').onchange = select_zones_onchange;        
  }
  
  if ($('select_phototheque_theme')){  
    $('select_phototheque_theme').onchange = select_phototheque_theme_onchange;  
  }
  
  if ($('select_phototheque_galerie')){  
    $('select_phototheque_galerie').onchange = select_phototheque_galerie_onchange;  
  }
  
  if ($('id_select_tree')){
    $('id_select_tree').onchange = select_tree_onchange
  }
  
}