code: function zF(a,b) {
      var z = parseInt(80000000,16);
      if (z & a) {
          a = a>>1;
          a &=~z;
          a |= 0x40000000;
          a = a>>(b-1);
      } else {
          a = a>>b;
      }
      return(a);
  }
docs: BEGIN CODE FOR GENERATING GOOGLE PAGERANK CHECKSUMS ----------------------------------------------------------------------------------------------