[AnhTuanCool]

@BlindChild - Here it is
Last update I believe
Revert your SHOWTHREAD template and remember to save your further modification than this one so you can hack it back later.
In your SHOWTHREAD template, find:

<!-- controls above postbits -->

Replace with

<if condition="$pagenumber != 1">
<div width="100%" id="firstpost">$postbits_firstpost</div>
</if>

<!-- controls above postbits -->

Save
In your postbit_firstpost template
Remove this part:

<if condition="$show['spacer']">
$spacer_open
<div style="padding:0px 0px $stylevar[cellpadding]px 0px">
<if condition="!$post['islastshown']"><!-- this is not the last post shown on the page --></if>
</if>

Remove this also:

<if condition="$show['spacer']">
</div>
$spacer_close
</if>

Done