Placing a Banner in the Header

[blue6995]

I have a logo in the Header, which is left aligned. I'm not sure but I think this is the code:

<a name="top"></a>
<!-- header -->
<div id="header"><div class="headerLeft">
<div class="logo">
<a href="http://www.rwf-forum.co.uk/vBulletin/index.php"><img src="http://www.rwf-forum.co.uk/vBulletin/images/styles/royalwelch/style/logo.gif" alt="The Royal Welch Forum" /></a>
</div>
</div></div>

What I am trying to do is place a Banner on the right hand side, aligned right. The code I have been given is:

<a href="http://www.rwf-forum.co.uk">
<img src="http://www.mydesignstorage.com/banners/enech14265_r_1.gif" border="0"></a>

Whenever I try and place this it ends up either on the top or bottom of the current logo or just to the right of it.

How can I fix this, please?

Thank you