Using "WWW" and No "WWW" has caused problems!

Hey! I seem to have a problem of google indexing both a www version of my and a non www version. However, Google indexes them by splitting the site. My www versions are indexed but only caching the text. While my non www version only get the graphics. For example
Non WWW. [URL="http://webcache.googleu...com&cd=5&hl=en&ct=clnk&gl=us&client=firefox-a
With WWW. http://webcache.googleusercontent.com/search?q=cache:6NlqWe9X0UAJ:www.numeroten.com/Tutorials/Entries/2010/8/6_iWeb_-_How_to_Get_Google_Analytics_on_Your_iWeb_Site.xml+www.numeroten.com&cd=2&hl=en&ct=clnk&gl=us&client=firefox-a

these are the same pages except the last one has www. Google is indexing my page twice and it seems to be splitting the text and graphics. Can i fix this by taking one out? how do i completely tka eout one or the other? For now i prefer the non www version because msot of my site is indexed that way, but every www that is indexed is split.

 

thx

Thats great i looked up some other things to, but does that mean i have to delete existing indexed pages that are www. how od i do that? just use the block url in webmaster?