You have several instances of the following code in template.css:
background-image:url('none'); background-repeat:repeat; background-attachment:scroll
Since template.css is located in /new_css/ it tries to find the background-image file 'none' in that same folder. If you don't need a background image there, use
instead, or remove the background properties altogether.
I would also suggest running your code through the W3C HTML validator. You have, for example, two opening <html> tags, and while you're declaring the XHTML doctype, you rarely 'self-close' an element, e.g. you use
<meta name="robots" content="index,follow">
<meta name="robots" content="index,follow" />