function showShare(share_link) {
      var article_divs = share_link.parentNode.parentNode.getElementsByTagName("div");
      for (i=0; i<article_divs.length; i++) {
        if (article_divs[i].className == "tab-content") article_divs[i].className = "tab-content-hide";
        else if (article_divs[i].className == "tab-content-hide") article_divs[i].className = "tab-content";
      }
      return false;
    }
    function addLabel(el,el_label) {
      if (el.value=='') el.value=el_label;
    }
    function removeLabel(el,el_label) {
      if (el.value==el_label) el.value='';
    }