var toggle = function(direction, display)
{
  return function()
  {
    var self = this;
    var ul = jQuery("ul", this);
    if( ul.css("display") == display && !self["block" + direction] ) {
      self["block" + direction] = true;
      ul["slide" + direction]("slow", function() {
        self["block" + direction] = false;
      });
    }
  };
}