[Theme: Chunky] Modifying a function

Hi all, my “problem” is this

<div id="header">
		<h1 id="site-title"><a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></h1>
		<h2 id="site-description"><strong><?php bloginfo( 'description' ); ?></strong></h2>
	</div>

I want the h2 part of my header, to display an image instead of the description. So, i’m looking for a php function who display only my image rather than a text. Actually, i use a workaround (i declared the image in the css but now is displayed WITH the taxt, which is ________)

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