如何用js调用ie的查找ctrl+F?

<!doctype  html  public  "-//W3C//DTD  HTML  4.0  Transitional//EN">
<html>
<head>
<title>Find  and  Replace  Demo</title>
<meta  http-equiv="Content-Type"  content="text/html;  charset=gb2312">
</head>
<body>
<script>
<!--
var  iFlag;
function  search()  {
  var  wPopupElements=wPopup.document.all;
  if  (wPopupElements.textcase.checked)
    {iFlag=4;}
  else
    {iFlag=0;}
  if  (wPopupElements.searchtext.value==null  ||  wPopupElements.searchtext.value=='')
    {
      wPopup.alert("Specify  a  value  to  search  for");
      return;
    }
  if  (rng.findText(wPopupElements.searchtext.value,10000,iFlag)==true)
    {
      rng.select();
      rng.scrollIntoView();
      rng.moveStart("character");
    }
  else  
    {wPopup.alert("End  of  document");}
}function  replace()  {
  var  wPopupElements=wPopup.document.all;
  if  (wPopupElements.textcase.checked)
    {iFlag=4;}
  else
    {iFlag=0;}
  if  (wPopupElements.searchtext.value==null  ||  wPopupElements.searchtext.value=='')
    {
      wPopup.alert("Specify  a  value  to  replace  for");
      return;
    }
  if  (rng.findText(wPopupElements.searchtext.value,-10000,iFlag)==true)
    {
      rng.text  =  wPopupElements.replacetext.value;
    }
  else  
    {wPopup.alert("End  of  document");}
}function  replaceall()  {
  var  rng  =  document.body.createTextRange();
  var  wPopupElements=wPopup.document.all;
  if  (wPopupElements.textcase.checked)
    {iFlag=4;}
  else
    {iFlag=0;}
  if  (wPopupElements.searchtext.value==null  ||  wPopupElements.searchtext.value=='')
    {
      wPopup.alert("Specify  a  value  to  replace  for");
      return;
    }
    for  (i=0;  rng.findText(wPopupElements.searchtext.value,10000,iFlag)!=false;  i++)
    {
      rng.scrollIntoView();
      rng.text  =  wPopupElements.replacetext.value;
    }
    setTimeout('wPopup.alert(i  +  "  item(s)  replaced!")',200);
}
//-->
</script><script>
<!--
function  gofind()  {
wPopup=window.open('about:blank','','width=350  height=110  left=200  top=200  menubar=no  resizeable=no  scrollbars=no  toolbar=no');
var  wPopupDoc=wPopup.document;
wPopupDoc.open();
wPopupDoc.write('<html>\n');
wPopupDoc.write('<head>\n');
wPopupDoc.write('<title>Find  and  Replace</title>\n');
wPopupDoc.write('<style>\n');
wPopupDoc.write('*  {font-size:11px;font-family:"Tahoma","Verdana","Arial"}\n');
wPopupDoc.write('button  {width:80}\n');
wPopupDoc.write('</style>\n');
wPopupDoc.write('</head>\n');
wPopupDoc.write('<body  bgcolor="buttonface"  leftmargin="0"  topmargin="0">\n');
wPopupDoc.write('<table  width="350"  border="0"  cellspacing="0"  cellpadding="3"  bgcolor="buttonface">\n');
wPopupDoc.write('<tr>\n');
wPopupDoc.write('<td>Find  what:</td>\n');
wPopupDoc.write('<td><input  type="text"  name="searchtext"  onchange="window.opener.rng=window.opener.document.body.createTextRange()"></td>\n');
wPopupDoc.write('<td><button  accesskey="S"  name="searchbutton"  onclick="window.opener.search()"><u>S</u>earch</button></td>\n');
wPopupDoc.write('</tr>\n');
wPopupDoc.write('<tr>\n');
wPopupDoc.write('<td>Replace  with:</td>\n');
wPopupDoc.write('<td><input  type="text"  name="replacetext"></td>\n');
wPopupDoc.write('<td><button  accesskey="R"  name="replacebutton"  onclick="window.opener.replace()"><u>R</u>eplace</button></td>\n');
wPopupDoc.write('</tr>\n');
wPopupDoc.write('<tr>\n');
wPopupDoc.write('<td  colspan="2"><input  type="checkbox"  name="textcase"  value="textcase">Match  Case</td>\n');
wPopupDoc.write('<td><button  accesskey="A"  name="replaceallbutton"  onclick="window.opener.replaceall()">Replace<u>A</u>ll</button></td>\n');
wPopupDoc.write('</tr>\n');
wPopupDoc.write('<tr>\n');
wPopupDoc.write('<td  colspan="2">&nbsp;</td>\n');
wPopupDoc.write('<td><button  accesskey="C"  name="cancelbutton"  onclick="window.close()"><u>C</u>ancel</button></td>\n');
wPopupDoc.write('</tr>\n');
wPopupDoc.write('</table>\n');
wPopupDoc.write('</body>\n');
wPopupDoc.write('</html>\n');
wPopupDoc.close();
}
//-->
</script>
<button  onclick="gofind()">Find  and  Replace</button><pre>
What  is  FlashGet?  
--------------------------------------------------------------------------------FlashGet  is  specifically  designed  to  address  two  of  the  biggest  problems  when  downloading  files:  Speed  and  management  of  downloaded  files.</pre>
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