I’ll try again Jack, probably I wrote something wrong and the code you wrote didn’t work for me. I’ll keep you updated. Thanks for your reply.
EDIT: Nothing to do Jack, I post my code:
<div class="header-logo"> <?php if( is_page( 'home' ) ) { echo ('etheme_logo(true)'); } else if ( is_page( 'about' ) ) { echo "('<img src=\"<?php bloginfo('template_url'); ?>/images/logo_1.png\" >')"; } ?> </div>
