How to hook into the Showthread and remove

[expat]

How to hook into the Showthread and remove the post bit?

$plugins->add_hook("showthread", "myPlugin_showthread");

if some setting is met, how can i remove the 

{$posts}

{$first_post}{$posts}

Can someone move it to the plugins?

function myPlugin_showthread(&$posts)
{}

is this correct?