Problem loading tag content in codebin

I am doing a javascript to play the result of a query on a tag, but the query does not appear in tag . I'm on the same page and calling the function by codebehide.

  function preenche_tit(tit_num_ptd, hea_end_ptd) { 
     self.opener.END.innerHTML = "  " + trim(hea_end_ptd) + " " + trim(tit_num_ptd) + " ";
    }

 <span class="form-control" id="END">&nbsp</span>