How do I change logo image and background picture

How do I change logo image and background picture on this template?

background image is:

templates/hot_ecommerce/images/bg1.png

logo html you can find in index.php of template:

...
<div class="logo_pad">
<a href="index.php"><img src="<?php echo $template_path ?>/images/logo.png" width="55" height="56" alt="joomla ecommerce template" /></a>
<span class="company_name"><?php echo $logoText; ?></span><br/>
<span class="company_slogan"><?php echo $sloganText; ?></span>
</div>
...