fieldset - className + position :'absolute'

Hi,
I have a question about fieldset and className.
I have more fieldsests and some of them have to be with background colour…
So I use className. It was OK, but when I add "position :‘absolute’ ", it overrides className. Fieldset was on correct position, but without background colour…
Is there any solution??
Or can I access fieldset as dom object and add style dynamically?

thank`s for response

Hi,
nobody nothing, so I had to found a solution… correct me, if I’m wrong or missing something…

      dhtmlXForm.prototype.items.fieldset.getFieldset=function(item,color){
        var obj = item.childNodes[0];
        obj.style.backgroundColor = color;
        var obj = item.childNodes[0].childNodes[0];
        obj.style.backgroundColor = color;
        return true;
      };
      
      dhxForm1.doWithItem('field_read_only', 'getFieldset', '#79FF94');