[jQuery] Problem with using hasClass() within .each()

[Carl Von Stetten]

Using jQuery 1.2.3
Firefox 2.0.0.14

I am trying to loop through the headers of a tablesorter table and find 
out which columns are being sorted which way.  I'm building an array of 
arrays that can be fed into the tablesorter.trigger function to resort 
the table after changes are made to the DOM.

The problem I'm having is after .each() iterates successfully through 
the first two columns (which currently are sorted) it then crashes on 
.hasClass().  When I say crashes, I mean that Firebug reports the 
following at the Console:

"$(this).hasclass is not a function"

Here is a snippet of my code.  The id of the table in question is "rdlist".

        var columnsort = new Array();
        parent.$("#rdlist th").each(function(idx){
                var curhead = new Array();
                if($(this).hasClass("headerSortDown")){
                    curhead.push(idx);
                    curhead.push(0);
                }
                else if($(this).hasclass("headerSortUp")){
                    curhead.push(idx);
                    curhead.push(1);
                }
                if(curhead.length)columnsort.push(curhead);
                console.log(columnsort);
            });

What am I doing wrong? :-(