var DOM = (document.getElementById) ? 1 : 0;
var NS4 = (document.layers) ? 1 : 0;
var IE4 = 0;
if (document.all)
{
 IE4 = 1;
 DOM = 0;
}
var win = window;   
var n = 0;
function findIt() {
 if (document.getElementById("searchstr").value != "")
  findInPage(document.getElementById("searchstr").value);
}
function findInPage(str) {
var txt, i, found;
if (str == "")
 return false;
if (DOM)
{
 win.find(str, false, true);
 return true;
}
if (NS4) {
 if (!win.find(str))
  while(win.find(str, false, true))
   n++;
 else
  n++;
 if (n == 0)
  alert("未找到指定内容.");
}
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("未找到指定内容.");
 }
}
return false;
}