Код:

    <div id=Inf_block_Left style="display:none">
    <!--НАЧАЛО-->
    <h2>НОВОСТЬ 1</h2>
    Текст НОВОСТИ
    <h2>НОВОСТЬ 2</h2>
    Текст НОВОСТИ
    <h2>НОВОСТЬ 3</h2>
    Текст НОВОСТИ
    </div>

    <div id=Inf_block_Right style="display:none">
    <!--НАЧАЛО-->
    <h2>НОВОСТЬ 1</h2>
    Текст НОВОСТИ
    <h2>НОВОСТЬ 2</h2>
    Текст НОВОСТИ
    <h2>НОВОСТЬ 3</h2>
    Текст НОВОСТИ
    </div>

    <script>if($("#navlogin").html()!=null){$("#Inf_block_Left").replaceWith("");$("#Inf_block_Right").replaceWith("")}</script>

    <script type="text/javascript">
    var L=$("#Inf_block_Left").html();$("#Inf_block_Left").replaceWith("");
    var R=$("#Inf_block_Right").html();$("#Inf_block_Right").replaceWith("");
    if($(".punbb").attr("id")=="pun-index"){

      var LeftSUM='', RightSUM='',block1='<div class="container" style="padding:5px;" id=News_';
      var block2="</div><br><br>";
    if(L!=null){ var c = L.split(/<h2>|<\/h2>/igm);
    for(i=1; i<c.length; i+=2){
    LeftSUM+=block1+'L'+(i+1)/2+' >'+'<h2><center>'+c[i]+'</center></h2>'+c[i+1]+block2;
    }LeftSUM='<td id=LeftNews width=21% valign=top>'+LeftSUM+'</td>';/*alert(LeftSUM);*/}
    if(R!=null){ var c = R.split(/<h2>|<\/h2>/igm);
    for(i=1; i<c.length; i+=2){
    RightSUM+=block1+'R'+(i+1)/2+' >'+'<h2><center>'+c[i]+'</center></h2>'+c[i+1]+block2;
    }RightSUM='<td id=RightNews width=21% valign=top>'+RightSUM+'</td>';/*alert(RightSUM);*/}

      if(LeftSUM!='' || RightSUM!=''){ $("#pun-main").html('<table width=100% id="NEWS"><tr valign=top>'+LeftSUM+'<td>'+$("#pun-main").html()+'</td>'+RightSUM+'</tr></table>'); };}
    </script>