WordPress Multisite (style sheet and images not displaying under wp-content themes folder)

I’ve created a multisite wordpress environment and made sites under it…

I copied over an existing theme I have to the multisite wp-content/theme folder to use it for all the sites.

My problem is that the paths are not showing up properly. An example would be:
http://sitename.com/images/aim_informatics_logo.png

Where the image should be located in:
http://sitename.com/wp-content/themes/blankrightsidebar/images/aim_informatics_logo.png

The multisite set up is as follows:
Main Site (Multisite)
Blog
News
Events
Documents

For some reason the header.php file is not linking the paths correctly. The theme I had is set up as a stand alone WP blog/page and it is linked under a directory… Example

www.sitename.com/blog

Where blog is my WP stuff saved.

Would appreciate if someone could help me with this…. I don’t think changing each url path to: “sitename.com/wp-content/themes/blankrightsidebar/” would be a great answer.

Thanks in advance.

Update:
The code is:

<div id="header">
<div id="navContainer" class="container_12"><div class="headerpush"></div><!-- end headerpush -->

<h1 class="grid_3 logo"><a href="../index.php"><img src="../images/logo.png" /></a></h1>
<!-- end mainLogo -->

Stylesheet code:

<link rel="stylesheet" type="text/css" media="all" href="<?php bloginfo( 'stylesheet_url' ); ?>" />

Basically, the structure of my site (multisite setup) is:
sitename (root)
– wordpress files (wp-content, admin, includes, etc…)
– Inside wp-content/theme/blankrightsidebar is where I store my theme files such as stylesheets, header.php etc.