sfHover = function() {
   var sfEls = document.getElementById("navi").getElementsByTagName("LI");
   for (var i=0; i<sfEls.length; i++) {
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     this.className+=" sfhover";
    }
    sfEls[i].onmouseout=function() {
     this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
    }
   }
  }
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