$(document).ready(function() {
  $("div.box_ranking select[name=root] option:selected").each( function() {
    var t = $(this).val();
    $("div.box_ranking select[name=type] option").hide();
    $("div.box_ranking select[name=type] option").each(function(){
      if(this.title==t) {
        this.style.display='block';
      }
    });
  })
  $("div.box_ranking select[name=root]").change(function(){
    var t = $(this).val(); var wasSelected = false;
    $("div.box_ranking select[name=type] option").each(function(){
      this.style.display='none';
      this.selected='';
      if(this.title==t) {
        this.style.display='block';
        if(!wasSelected) {
          this.selected = 'selected';
          wasSelected = true;
        }
      }
    });
  });
});