is there proceed raise css an html <select> the <option> ie 6?

internet path-finder 6 seems totally replace css classes manners select, choice optgroup tags.

is there proceed bypass discount (except exercise new chronicle ie) ?

edit : some-more precise, i'm perplexing build hierarchy between options example:

here's html dash :

<select name="hierarchicallist" multiple="multiple">
  <option class="group niv0">os developers</option>
  <option class="group niv1">linux</option>
  <option class="user niv2">linus torvald</option>
  <option class="user niv2">alan cox</option>
  <option class="group niv1">windows</option>
  <option class="user niv2">paul allen</option>
  <option class="user niv2">bill gates</option>
  <option class="group niv1">mac os</option>
  <option class="user niv2">steve wozniaz</option>
</select>

and here's css rules, works glorious new browser (like ff3) nonetheless operative during ie6 :

 name choice {
   line-height: 10px;
 }

 name option.group {
    font-weight: bold; 
    background: url(path_to_group_icon.gif) no-repeat; 
    padding-left: 18px;
 }

 name option.user {
    background: url(path_to_user_icon.gif) no-repeat; 
    padding-left: 18px;
 }

 name option.niv0 { margin-left: 0px; }
 name option.niv1 { margin-left: 10px; }
 name option.niv2 { margin-left: 20px; }