5
It depends a little bit on the theme you are using. So look in your theme directory.
Mosttimes you find something like theme_blockleft.html, etc.
<{if $block.title}>
<div class="blockTitle"><{$block.title}>div>
<{/if}>
<div class="blockContent"><{$block.content}>div>
Try to put your image in the first div:
<div class="blockTitle">
<{$block.title}>
<img class="blockImage" alt="<{$block.title}>" src="images/block<{$block.content}>.jpg" />
div>
which displays /themes/yourtheme/images/block1.jpg etc.
