I need help - Logo by category

[Jaizu]

Hey guys!
I'm new here and I'm searching for a tutorial or instructions to put custom logos on my Forum.
My Forum is it: http://tuotaku.hakome.com/index.php
And my header is it:

Code:

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<div id="container"> <a name="top" id="top"></a> <img class="logoimg" src="{$mybb->settings['bburl']}/images/logobg.png"> <div class="logotipo"> {$welcomeblock} </div> <div class="navigationbg"> <navigation> </div> <div class="menup"><b> <a href="{$mybb->settings['bburl']}/index.php">Índice</a> - <a href="{$mybb->settings['bburl']}/portal.php">Portal</a> </b></div> <br /> <div id="content"> <div class="pm_alert"> <a href="{$mybb->settings['bburl']}/Tema-Windows-Ver-Anime-en-Full-HD-sin-problemas?pid=624#pid624"><b>[Windows]</b>Ver Anime en Full HD sin problemas.</a></div> {$comments_alert} {$pm_notice} {$bannedwarning} {$bbclosedwarning} {$unreadreports} {$pending_joinrequests}

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I adapt my code to make the logo with a img and not with a custom css background.
I can install php in templates or XThreads without any problem.
Thanks a lot and sorry for basic english, I'm from Spain~