Safari document.getElementByClassName problem

Hi,
I am having a problem under safari with the above mentioned method.

In my example document I have something like the following:

  <div id="label_2" class="lab15">Q1</div>
  <div id="label_6" class="lab15">Q1</div>
  <div id="label_10" class="lab15">Q1</div>
  <div id="label_14" class="lab15">Q1</div>

I am trying to select a bunch of elements with the same class name as such:

         this.labels=document.getElementsByClassName(this.element.className);
         for (i=0;i<this.labels.length;i++) {
                Element.addClassName(this.labels[i],"selected_label");
        }


I have verified that i tries to select with the correct class, but it
never returns more than 1 element. Under firefox and family it works
fine, selecting all 4.

Has anyone seen this kind of behavior before? Is there a work around 
or fix I should know about?

Thanks
Pelle
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