parent class problem (actualy me being noob problem)

parent class problem (actualy me being noob problem)

Hi,

I'm trying to put a css opacity effect on certain elements.
then change it on mouse over.
that works,
now i want to exclude 1 of them that has a child with a different class then the others.

let me give an example:
this is working (got it from somewhere on the net)

$(function(opacity_thumbs) {

  // set opacity for all thumbs to 30%
  $("div.thumb").css("opacity","0.3");

  // on mouse over
  $("div.thumb").hover(function () {
   
    // set opacity to 100%
    $(this).stop().animate({
    opacity: 1.0
    }, "fast");
    },
       
    // on mouse out
    function () {
           
      // set opacity back to 30%
      $(this).stop().animate({
      opacity: 0.3
      }, "normal");
   });
});   
   
now i want to exclude the active thumb from being set to opacity 30%
it also has to work when the active thumb changes...

generated html code looks like this:
<div id="thumb_container">
<div style="opacity: 0.3;" id="thumb0" class="thumb">
 <img class="active_thumb" id="a_0" onclick='JavaScript:refresh("a_0","111.jpg");' src="category/badkamer/thumbnails/111.jpg">
</div>
<div style="opacity: 0.3;" id="thumb1" class="thumb">
 <img class="cellborder" id="a_1" onclick='JavaScript:refresh("a_1","222.jpg");' src="category/badkamer/thumbnails/222.jpg">
</div>
 etc






i was thinking something like:
      $('img.active_thumb').parent().css('opacity', '1.0');

but how to get that into previous script?
anyone has some free time to help?
thx