You may try to use this code. Please put your own ad codes and make a backup first of your original pligg.tpl file.
Code:
{config_load file="/libs/lang.conf"}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="verify-v1" content="1NJkXleoX0jnCzXsi4W4U+GEajOL0d0Xyk87AAohlRA=" />
{include file="meta.tpl"}
{if $Voting_Method eq 1}
<link rel="stylesheet" type="text/css" href="{$my_pligg_base}/templates/{$the_template}/css/main.css" media="screen" />
{else}
<link rel="stylesheet" type="text/css" href="{$my_pligg_base}/templates/{$the_template}/css/star_rating/main.css" media="screen" />
<link rel="stylesheet" type="text/css" href="{$my_pligg_base}/templates/{$the_template}/css/star_rating/star.css" media="screen" />
{/if}
{if $enable_categorycolors eq 'true'}
<link rel="stylesheet" type="text/css" href="{$my_pligg_base}/templates/{$the_template}/css/catcolors.css" media="screen" />
{/if}
<script src="{$my_pligg_base}/js/jspath.php" type="text/javascript"></script>
{checkForCss}
{checkForJs}
<style type="text/css" media="screen">@import "{$my_pligg_base}/templates/{$the_template}/css/sneak.css";</style>
<script language="JavaScript" type="Text/JavaScript" src="{$my_pligg_base}/templates/{$the_template}/js/toggle.js"></script>
{if $Spell_Checker eq 1}
<script src="{$my_pligg_base}/3rdparty/speller/spellChecker.js" type="text/javascript"></script>
{literal}
<script language="javascript" type="text/javascript">
function openSpellChecker(commentarea) {
var txt = document.getElementById(commentarea);
var speller = new spellChecker( txt );
speller.openChecker();
}
</script>
{/literal}
{/if}
{if $Spell_Checker eq 2}
{literal}
<script type="text/javascript">
function openSpellChecker(tarea){
var thetext = document.getElementById(tarea);
var subWindow = window.open('./3rdparty/speller2/check.php?tarea='+tarea+'&content=' + thetext.value,'def','height=300,width=800');
}
</script>
{/literal}
{/if}
{literal}
<script type="text/javascript">
<!--
function show_hide_user_links(thediv)
{
if(window.Effect){
if(thediv.style.display == 'none')
{Effect.Appear(thediv); return false;}
else
{Effect.Fade(thediv); return false;}
}else{
var replydisplay=thediv.style.display ? '' : 'none';
thediv.style.display = replydisplay;
}
}
//-->
</script>
<script type="text/javascript">
/***********************************************
* Bookmark site script- Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
***********************************************/
function bookmarksite(title, url){
if (document.all)
window.external.AddFavorite(url, title);
else if (window.sidebar)
window.sidebar.addPanel(title, url, "")
}
</script>
{/literal}
{checkActionsTpl location="tpl_pligg_pre_title"}
<title>{$pretitle}{#PLIGG_Visual_Name#}{$posttitle}</title>
<link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="http://{$server_name}{$my_pligg_base}/rss2.php"/>
<link rel="icon" href="{$my_pligg_base}/favicon.ico" type="image/x-icon"/>
<script src="{$my_pligg_base}/js/xmlhttp.php" type="text/javascript"></script>
</head>
<body {$body_args}>
<div id="wrap">
<div id="header">
{include file=$tpl_header.".tpl"}
</div><!-- header end -->
{if $user_authenticated ne true}<div id="content-wrap1">
{else}
{if $cat_url neq ""}<div id="content-wrap2">
{else}<div id="content-wrap3">
{/if}
{/if}
<div id="sidebar">
{include file=$tpl_right_sidebar.".tpl"}
</div><!-- sidebar end -->
<div id="contentbox">
<div id="breadcrumb">
{if $navbar_where.show neq "no"}
<a href = "{$my_base_url}{$my_pligg_base}">{#PLIGG_Visual_Breadcrumb_SiteName#}{#PLIGG_Visual_Breadcrumb_Home#}</a>
{if $navbar_where.link1 neq ""} » <a href="{$navbar_where.link1}">{$navbar_where.text1}</a>{elseif $navbar_where.text1 neq ""} » {$navbar_where.text1}{/if}
{if $navbar_where.link2 neq ""} » <a href="{$navbar_where.link2}">{$navbar_where.text2}</a>{elseif $navbar_where.text2 neq ""} » {$navbar_where.text2}{/if}
{if $navbar_where.link3 neq ""} » <a href="{$navbar_where.link3}">{$navbar_where.text3}</a>{elseif $navbar_where.text3 neq ""} » {$navbar_where.text3}{/if}
{if $navbar_where.link4 neq ""} » <a href="{$navbar_where.link4}">{$navbar_where.text4}</a>{elseif $navbar_where.text4 neq ""} » {$navbar_where.text4}{/if}
{/if}
</div>
{if $pagename eq "index" || $pagename eq "story"}
<div align="left" style="float: left">
/* remove this line and put medium rectangle adsense code */
</div>
<div align="right">
/* remove this line and put adbrite medium rectangle ad code */
</div>
<div style="clear: both"></div>
{/if}
<div id="inside">
{checkActionsTpl location="tpl_pligg_above_center"}
{include file=$tpl_center.".tpl"}
{checkActionsTpl location="tpl_pligg_below_center"}
</div><!-- inside end -->
</div><!-- contentbox end -->
</div><!-- content-wrap end -->
{if $pagename eq "index" || $pagename eq "story"}
<div align="center">
/* remove this line and put 728x90 link unit adsense code */
/* remove this line and put 728x90 text link ads code */
/* remove this line and put 728x90 adsense code */
</div>
{/if}
</div><!-- wrap end -->
{include file=$tpl_footer.".tpl"}
</body>
</html>