function urlReWrite(){
  if(isset($_SERVER['PATH_INFO'])){
    $c=$_SERVER["PATH_INFO"];  //取得path_info
  }
  if(eregi("^/[a-z]{1,16}.[0-9]{1,16}.html$",$c)) {

        $a=substr($itemPath,1,-5);  //去掉"/",".html"

        $b=explode('.',$a);  //处理成数组备用;

  }else{
    die('Url Tags is Error');
  }
  
  return $b[1];   

}