adding an additional image to header

Newbie here, I have designed a new sight using WordPress for the first time and I am almost ready to publish it to my custom domain name. I just need a few changes to the aesthetics. I would like to add an additional image besides the logo that is already there to the header. I would like to add an image that is 150 x 150 pixels to the right hand portion of the header.

I am using WordPress 3.3.1. My theme is Wiredrive Classic 1.0.4.
Here is a link to my site http://ecbiz115.inmotionhosting.com/~dougla34/

I know very little about php and CSS. I am slowly learning html.

Here is my Wiredrive Classic: Header (header.php)
http://pastebin.com/GezGHKJd

Here is what I perceive to be the correct portion of the Wiredrive Classic: Stylesheet (style.css)
http://pastebin.com/r5qWSMVw

Please treat me as I have to treat our customers (assuming they know nothing about anything).

Your help will help a small public water system present themselves well in the publics eye.
Thanks, smythacker

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