UI slider, little issue

UI slider, little issue

Hi

I have a question: how to remove a border from ui slider button when it's active? In other cases I use trick
  1. <a href="#" onfocus="this.blur()">
Okay, it works, but not in jquery.slider.ui

  1.         if ($(".ui-slider-handle", this.element).length == 0)
  2.             $('<a href="#" onfocus="this.blur()"></a>')
  3.                 .appendTo(this.element)
  4.                 .addClass("ui-slider-handle");
  5.         if (o.values && o.values.length) {
  6.             while ($(".ui-slider-handle", this.element).length < o.values.length)
  7.                 $('<a href="#" onfocus="this.blur()"></a>')
  8.                     .appendTo(this.element)
  9.                     .addClass("ui-slider-handle");
  10.         }
for example: here http://jqueryui.com/demos/slider/default.html if I push the button it have a dotted border

So, question is: how to remove a border?

PS: sorry for my english =)