function getMetaTag(tagName) {

  var metaTags=document.getElementsByTagName("meta");
  for(var i in metaTags){ 
    if(metaTags[i].name == tagName) {
      return metaTags[i].content;
    }
  }
  return "";
}

function addCategory(category, valueToAppend) {

  if (valueToAppend != "") 
    return category + " > " + valueToAppend;
  else
    return category;
}

var catValue = "NYTimesglobal";
catValue = addCategory(catValue, getMetaTag("WT.cg_n"));
catValue = addCategory(catValue, getMetaTag("WT.cg_s"));
DM_cat(catValue);
DM_tag();