I'm quite new to javascript but have undertaken a task to get better aquainted with it. However, I am running into some problems with jQuery. The following javascript is the code that is in a third party jQuery plugin and I would love to be able to override the funFunction() function here to do my own implementation. Is this possible, if so, how can I do it? I've been doing a fair amount of searching and have tried a number of methods for overriding the function using things like:

jQuery.blah.funFunction = funtion() { alert("like this"); };

Main code:

(function($) { 
    $.extend( {
        blah: new function() { 
          this.construct =  = function(settings) {
              //Construct... stuff
          }; 
          function funFunction() {
            //Function I want to override
          } 
        } 
    });
})(jQuery);

For those further interested I am trying to override tablesorter so that the only way a user can sort a column is in ascending order only.

Edit:

There is a wordpress installation that uses WP-Table-Reloaded which in turn uses this plugin. I don't want to change the core code for this plugin because if there was ever an update I would then have to make sure that my predecessor knew exactly what I had done.

I've been programming for a long time and feel like I should easily be able to pick up javascript whilst also looking at jQuery. I know exactly what I need to do for this, just not how I can override this function.