tablesorter plugin new version lost sort images

tablesorter plugin new version lost sort images

I updated my tablesorter code some time ago to the newer version, but since then the images for sorting don't show up in the table head.  I even tried using the new css and table intialization using cssAsc and ccssDesc and cssHeader coomands in the intialization.. and put things like this in my css.  The initlization code is below that.  There is no example in the documentation so I am not sure I am doing it right.  Please advise. 
  1. th.headerSortUp { 
        background-image: url(../img/small_asc.gif); 
        background-color: #3399FF; 
    } 


     $("#" + tableId).tablesorter({widthFixed: true, headers:{4:{sorter:false}, 5:{sorter:false}}, cssHeader:{}, cssAsc:{}, cssDesc:{}}) .tablesorterPager({container: $("#pager")}); $("#" + tableId).bind("sortEnd", function(){ hideSortProgress(tableId); }).bind("sortStart", function(){ showSortProgress(); });