Need help adding HTML in "Welcome Headers" add-on

[NThomas]

I'm using an add on called Welcome Headers that adds an annoying "welcome" message for users that aren't registered. I've finally figured out how to add text but I'm in over my head adding the HTML from Google Adsense beside the text like here.



Any advice on how the HTML should look? Right now my site looks like this.



I just need to get it looking like this instead:



Here's the existing code:

<script type="text/javascript"><!--
google_ad_client = "pub-9253554875337282";
/* Guest AdSense */
google_ad_slot = "2623077696";
google_ad_width = 300;
google_ad_height = 250;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script><strong>Welcome to Austin Urban Forum</strong> the online source for architecture, transportation, real estate development and news & issues in Austin and Central Texas.<br><br>You are currently viewing the site as a guest. To gain full access to the Austin Urban Forum <a href="http://forum.austinurbanforum.com/register.php"><strong>register for free</strong></a> and enjoy benefits such as:<br><br>
?	No advertisements<br>
?	Participation in polls<br>
?	E-mail with other members<br>
?	Ability to post and comment<br>
?	Share your own and view other member?s pictures<br><br>
If you have any problems with the registration process or your logging into your account, please <a href="http://forum.austinurbanforum.com/sendmessage.php">contact us</a>.

I'm betting it's just a simple HTML code so it shouldn't be too hard to find someone wanting to help me out