Sticky table header with jQuery

Copytable.fixed_table_header{
  position: fixed;
  top: 0;
  width: auto;
  display: none;
  border: none;
  margin: 0;
}

Copy;(function($) {
   $.fn.fixHeader = function() {
      return this.each(function() {
         var $table = $(this),
            $t_fixed;

         function init() {
            $t_fixed = $table.clone();
            $t_fixed.find('tbody').remove().end().addClass('fixed_table_header').insertBefore($table);
            resizeFixed();
         }

         function resizeFixed() {
            $t_fixed.find("th").each(function(index) {
               $(this).css("min-width",$table.find("th").eq(index).width()+"px");
            });
         }

         function scrollFixed() {
            var offset = $(this).scrollTop(),
            tableOffsetTop = $table.offset().top,
            tableOffsetBottom = tableOffsetTop + $table.height() - $table.find("thead").height();
            if(offset < tableOffsetTop || offset > tableOffsetBottom)
               $t_fixed.hide();
            else if(offset >= tableOffsetTop && offset <= tableOffsetBottom && $t_fixed.is(":hidden"))
               $t_fixed.show();

            // left-align $t_fixed with $table
            $t_fixed.css("left", $table.offset().left - $(this).scrollLeft());
         }

         $(window).resize(resizeFixed);
         $(window).scroll(scrollFixed);

         init();
      });
   };
})(jQuery);