function findInPage(str) {
  var txt, i, found;
  if (str == "")
    return false;
  if (NS4) {
    if (!win.find(str))
      while(win.find(str, false, true))
        n++;
    else
      n++;
    if (n == 0)
      alert("没发现你要找的！");
  }
  if (IE4) {
    txt = win.document.body.createTextRange();
    for (i = 0; i <= n && (found = txt.findText(str)) != false; i++) {
      txt.moveStart("character", 1);
      txt.moveEnd("textedit");
    }
    if (found) {
      txt.moveStart("character", -1);
      txt.findText(str);
      txt.select();
      txt.scrollIntoView();
      n++;
    }
    else {
      if (n > 0) {
        n = 0;
        findInPage(str);
      }
      else
        alert("没发现你要找的！");
    }
  }
  return false;
}