Page reloads it will be at the same scroll position.

Chatlog.php

<?php $db = mysql_connect("localhost", "root") or die("Could not connect."); //username and password
mysql_select_db("cute") or die(mysql_error());

$getnummessages="SELECT COUNT(*) as messagecount from chatmessages";

$getnummessages2=mysql_query($getnummessages) or die("blah");

$getnummessages3= mysql_result($getnummessages2, 0);

if($getnummessages3>40)

{

   $startrow=$getnummessages3-20;

}

else

{

  $startrow=0;

}

$getmsg="SELECT name, message from chatmessages order by postime ASC limit $startrow,$getnummessages3";

$getmsg2=mysql_query($getmsg) or die(mysql_error());

function replacesmiley($msg)
{
         $msg = str_replace('', '<img src="smile.gif" alt="" />', $msg);
         $msg = str_replace('', '<img src="sad.gif" alt="" />', $msg);
         $msg = str_replace('', '<img src="tongue.gif" alt="" />', $msg);
         return $msg;
}

echo replacesmiley($text);

function filterBadWords($str)
{
    $result = mysql_query("SELECT badwords FROM clean") or die(mysql_error()); 
    $replacements = "*";
    
    while($row = mysql_fetch_assoc($result))
    {
          $str = eregi_replace($row['badwords'], str_repeat('*', strlen($row['badwords'])), $str);
    }  
    
    return $str;
}



while($getmsg3=mysql_fetch_array($getmsg2))

{

  $getmsg3['message'] = replacesmiley($getmsg3['message']);
  $getmsg3['message'] = filterBadWords($getmsg3['message']); //Smiley faces
  print "<font color='blue'><b>$getmsg3[name]:</b></font> $getmsg3[message]<br>";



}






?>

<script>
setTimeout("window.location.replace('chatlog.php')",2000);
var objDiv = document.body;
objDiv.scrollTop = objDiv.scrollHeight;
</script>

Javascript for to reload the page in same scroll position

<script type="text/javascript">
<!--
cookieName="page_scroll"
expdays=365

// An adaptation of Dorcht's cookie functions.

function setCookie(name, value, expires, path, domain, secure){
if (!expires){expires = new Date()}
document.cookie = name + "=" + escape(value) + 
((expires == null) ? "" : "; expires=" + expires.toGMTString()) +
((path == null) ? "" : "; path=" + path) +
((domain == null) ? "" : "; domain=" + domain) +
((secure == null) ? "" : "; secure")
}

function getCookie(name) {
var arg = name + "="
var alen = arg.length
var clen = document.cookie.length
var i = 0
while (i < clen) {
var j = i + alen
if (document.cookie.substring(i, j) == arg){
return getCookieVal(j)
}
i = document.cookie.indexOf(" ", i) + 1
if (i == 0) break
}
return null
}

function getCookieVal(offset){
var endstr = document.cookie.indexOf (";", offset)
if (endstr == -1)
endstr = document.cookie.length
return unescape(document.cookie.substring(offset, endstr))
}

function deleteCookie(name,path,domain){
document.cookie = name + "=" +
((path == null) ? "" : "; path=" + path) +
((domain == null) ? "" : "; domain=" + domain) +
"; expires=Thu, 01-Jan-00 00:00:01 GMT"
}

function saveScroll(){ // added function
var expdate = new Date ()
expdate.setTime (expdate.getTime() + (expdays*24*60*60*1000)); // expiry date

var x = (document.pageXOffset?document.pageXOffset:document.body.scrollLeft)
var y = (document.pageYOffset?document.pageYOffset:document.body.scrollTop)
Data=x + "_" + y
setCookie(cookieName,Data,expdate)
}

function loadScroll(){ // added function
inf=getCookie(cookieName)
if(!inf){return}
var ar = inf.split("_")
if(ar.length == 2){
window.scrollTo(parseInt(ar[0]), parseInt(ar[1]))
}
}

// add onload="loadScroll()" onunload="saveScroll()" to the opening BODY tag

// -->
</script>

Any one can combinie my script with this script?

im had solved the problem thanks you