Hi KidaraJaed!

Because the script you are using comes directly from the WoW Armory, it doesn't contain any DKP data. But I did modify the script to gather data from other tables contained on the same page. So in order to add DKP you'll have to add a "Add-On Roster for World of Warcraft" type of widget, which requires the addon to gather the data... then you can use this code to include the wow auto roster (reference):

$(document).ready(function(){
 $('#wowroster').wowrosterxsl({
  addAutoRoster: true,
  replaceRanks : true, // set to false by default; ranks values below show the default settings
  ranks : {
   0 : "Guild Leader",
   1 : "Officer",
   2 : "Classleader",
   3 : "Raider",
   4 : "Member",
   5 : "Trial",
   6 : "Alt"
  }
 })
})

then hide the auto roster using this CSS:

/* Hide the WoW Auto Roster */
.gpWidget-gpwowautoroster { display: none; }