"a123bc456" 이라는 값을 함수로 넣으면
123456 만 리턴합니다.  이것도 찾다가~~ 찾다가 걍 만들어버렸습니당..


    function changenum(instring)
                {
      var pnumresult="";
       for (ic=0; ic<instring.length; ic++)
       {
          charpnum = instring.substr(ic,1);
          if (charpnum.charCodeAt(0) > 47 && charpnum.charCodeAt(0) < 58)
          {
                     pnumresult = pnumresult + charpnum;
          }
       }
        return pnumresult;
                }