function oninit1(){
  defActionPlusCriteres();
}

function defActionPlusCriteres(){
  $("div_plus_criteres").hide();
  $("span_btnPlusDeCriteres").onclick=function (evt){
      if (this.showing){
         Effect.BlindUp('div_plus_criteres'); 
         this.showing=false;
     }else{
         Effect.BlindDown('div_plus_criteres'); 
         this.showing=true;
     }
     return false;
  }
}