<script type="text/javascript" src="http://www.axiomfiles.com/Files/258012/wow-roster-xsl.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
 $('#wowroster').wowrosterxsl({
  replaceRanks : true, // set to false by default; ranks values below show the default settings
  ranks : {
   0 : "Guild Leader",
   1 : "Council",
   2 : "Officer",
   3 : "Veteran",
   4 : "Member",
   5 : "Alt",
   6 : "New Recruit",
   7 : "Probation"
  }
 })
})
// CODE TO RESORT THE ROSTER
$(window).load(function(){
 $('#wowroster').tablesorter({ sortList: [ [3,1], [0,0] ] });
})
</script>

• The bracketed numbers in red set the sort order of the roster.
• The GPUser column is actually hidden if you don't use it, so it is column #1. That's why the [3,1] code above targets the Level column
  
  

  0	1	2	3	4	5	6	7	8	9	10
  Name	GPUser	AP	Level	Race	Class	Rank	Weekly XP	Lifetime XP	Notes	DKP

  
  
• The blocks of numbers tell the tablesorter script which column and the sort direction:
  
  [ [columnIndex, sortDirection], ... ]
  
  columnIndex is the column number (see above).
  sortDirection is 0 for Ascending and 1 for Descending.
  , ... shows that you can optionally sort multiple columns by adding more blocks, separated by commas.
  
  
• So, the block [3,1], [0,0] tells the tablesorter to sort:
  
  
  • [3,1] : The Level column in a descending order (highest number first)
  • [0,0] : The Name column in ascending order (A at the top, Z at the bottom).