Equal heights plugin not calculating proper height [closed]

Question

http://www.tmla.org/new_site/

That's the relevant link. The issue appears when you refresh the page. Loading the page normally from the browser or from your cache seems to be fine. Not sure why this is happening. Can anyone help shed some light on this? Any help would be appreciated. Code to follow:

    (function($) {
        $.fn.equalHeights = function(minHeight, maxHeight) {
            column1 = 0;
            column2 = 0;
            column3 = 0;

            //FIND THE TOTAL HEIGHT OF EACH COLUMN BY ADDING UP EACH WIDGET, SORTING BY UNIQUE COLUMN CLASS
            this.each(function() {
                if($(this).hasClass('column1')) {
                    column1 = column1 + $(this).height();
                } else if($(this).hasClass('column2')) {
                    column2 = column2 + $(this).height();
                } else if($(this).hasClass('column3')) {
                    column3 = column3 + $(this).height();
                }
            });

            //alert(column1);
            //alert(column2);
            //alert(column3);


            //FIND THE TALLEST COLUMN
            tallest = Math.max(column1, column2, column3);

            //alert(tallest);

            //SIMPLE MATH TO DETERMINE HOW MUCH HEIGHT TO MAKE THE LAST WIDGET OF EACH COLUMN SO THEY LINE UP NICE AND NEAT
            column1 = tallest - column1 + $('#left_sidebar .widget').last().height();
            column2 = tallest - column2 + $('#center_sidebar .widget').last().height();
            column3 = tallest - column3 + $('#right_sidebar .widget').last().height();

            //alert('Add how much to Column 1: ' + column1);
            //alert('Add how much to Column 2: ' + column2);
            //alert('Add how much to Column 3: ' + column3);

            //alert('Left' + $('#left_sidebar .widget').last().css('height'));
            //alert('Center' + $('#center_sidebar .widget').last().css('height'));
            //alert('Right' + $('#right_sidebar .widget').last().css('height'));

            if(column1 != '0px') {
                $('#left_sidebar .widget').last().css('height', column1 + 'px');
            }

            if(column2 != '0px') {
                $('#center_sidebar .widget').last().css('height', column2 + 'px');
            }

            if(column3 != '0px') {
                $('#right_sidebar .widget').last().css('height', column3 + 'px');
            }
        } 
    })(jQuery);