html, body {
  background: #6699FF;
  }
div.ol_corner { z-index: 3; overflow: hidden;
  position: absolute;
  top: 0; left: 0;
  height: 10px; width: 11px;
  background: url(../images/ol-blau.gif);
  }
div.or_corner { z-index: 3; overflow: hidden;
  position: absolute;
  top: 0; right: 0;
  height: 10px; width: 11px;
  background: url(../images/or-blau.gif);
  }
div.ul_corner { z-index: 3; overflow: hidden;
  position: absolute;
  bottom: 0; left: 0;
  height: 10px; width: 11px;
  background: url(../images/ul-blau.gif);
  }
div.ur_corner { z-index: 3; overflow: hidden;
  position: absolute;
  bottom: 0; right: 0;
  height: 10px; width: 11px;
  background: url(../images/ur-blau.gif);
  }
/* IE6 Hack begin */
* html div.or_corner { right: -1px; }
* html div.ur_corner { right: -1px; bottom: -1px; }
* html div.ul_corner { bottom: -1px; }
/* IE6 Hack end */