How to install?!
Open:
templates/Default/addnews.tpl

Search:
<td><input type="text" name="title" value="{title}" maxlength="150" class="f_input" /></td>
</tr>


Add
id="title"

and
{include file="engine/modules/f_relates.php"}




Example :
<td><input type="text" name="title" value="{title}" maxlength="150" class="f_input" id="title" /></td>
</tr>
{include file="engine/modules/f_relates.php"}

In
engine folder----->modules folder
create a file
f_relates.php
add this code inside and upload

<?PHP
/*
*/
if(!defined('DATALIFEENGINE'))
{
die("Hacking attempt!");
}

echo "
<SCRIPT LANGUAGE=\"JavaScript\">
function find_relates ( )
{
var ajax = new dle_ajax();

var title = ajax.encodeVAR( document.getElementById('title').value );
var varsString = \"title=\" + title;

ajax.onShow ('');
ajax.requestFile = 'engine/ajax/find_relates.php';
ajax.method = 'POST';
ajax.element = 'related_news';
ajax.sendAJAX(varsString);

return false;

};
</SCRIPT>";
echo <<<HTML
<tr>
<td width="110" height="25" nowrap="nowrap">&nbsp;</td>
<td><input class="bbcodes" type="button" onclick="find_relates(); return false;" value="Find related news" ><span id="related_news"></span></td>
</tr>
HTML;

?>
Done enjoy