Call to undefined function: bloginfo() -WORDPRESS

I am using the most recent version of wordpress (2.3.1)..I have downloaded a free wordpress theme and it seams to be displaying absolutely fine. However, when I try to visit an exact section, for example:
mydomain.com/wp-content/themes/themename/header.php

I get nothing but this error:
Fatal error: Call to undefined function: bloginfo()

It gives me the filename plus the line the error is on, although there is the bloginfo function on a number of different lines in the file.

Any ideas what could be causing this and how it can be fixed?

Thanks!

 

What were you expecting to see? the code in the header? I'm afraid its impossible in a browser

 

Nope, I was expecting to see the header..kind of like if i got to the same path only with sidebar.php, i see the sidebar..

 

really? u can see the sidebar by typing the path in your browser? hmm....it isn't a html file,is it?

 

yea, I can see the sidebar..no css in it or anything but the links and everything appear. Nope, they are all php files.

 

can you link to the page that gives you the error as well as the homepage of the site?

 

sure
http://www.domainhost.co.in -the site
http://www.domainhost.co.in/wp-content/themes/hosting/header.php -the error page

Basically, my overall goal is to have the header replace this one here:
http://www.domainhost.co.in/clients/

however when I made the change it doesn't appear, all that shows up is the code upto the first bloginfo which is:
<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />

So that is what makes me think this error is what is causing the header to not appear

btw..thanks for your help guys