Move the "newicons" directory and it's contents into your "icons" directory. Now edit your postlist.php file and change this:
<br /> $postrow[$z]['color'] = $rowcolor;<br /> $postrow[$z]['indentsize'] = "0";<br /> $postrow[$z]['icon'] = $icon;<br /> $postrow[$z]['imagesize'] = $imagesize;<br /> $postrow[$z]['Number'] = $Number;<br /> $postrow[$z]['Subject'] = $Subject;<br /> $postrow[$z]['Username'] = $Username;<br /> $postrow[$z]['UserStatus'] = $UserStatus;<br /> $postrow[$z]['Views'] = $Counter;<br /> $postrow[$z]['Replies'] = $printreplies;<br /> $postrow[$z]['time'] = $time;<br /> $postrow[$z]['pageprint'] = $pageprint;<br /> $postrow[$z]['Rating'] = $ThreadRating;<br /> $postrow[$z]['posterid'] = $posterid;<br /> $postrow[$z]['UserNumber'] = $UserNumber;<br />
to this:
<br /> if (stristr($rowcolor,"new")) {<br /> $icon = "newicons/$icon";<br /> }<br /> $postrow[$z]['color'] = $rowcolor;<br /> $postrow[$z]['indentsize'] = "0";<br /> $postrow[$z]['icon'] = $icon;<br /> $postrow[$z]['imagesize'] = $imagesize;<br /> $postrow[$z]['Number'] = $Number;<br /> $postrow[$z]['Subject'] = $Subject;<br /> $postrow[$z]['Username'] = $Username;<br /> $postrow[$z]['UserStatus'] = $UserStatus;<br /> $postrow[$z]['Views'] = $Counter;<br /> $postrow[$z]['Replies'] = $printreplies;<br /> $postrow[$z]['time'] = $time;<br /> $postrow[$z]['pageprint'] = $pageprint;<br /> $postrow[$z]['Rating'] = $ThreadRating;<br /> $postrow[$z]['posterid'] = $posterid;<br /> $postrow[$z]['UserNumber'] = $UserNumber;<br />
and that should do the trick.
Tested it here and it seemed to work.