Sub themes not working

I tried to create a sub-theme based on the latest marinelli release because I wanted to modify the page.tpl.php file a little bit.

I could create the subtheme, and it worked just fine as long as I didn't have a different page.tpl.php file. However, when I created a page.tpl.php file [in directory sub-theme/templates] even when the new file was an exact copy of the original in the Marinelli theme the site did not display correctly.

After considerable experimentation, I found that the sub-theme would work correctly if I copied the /js and the /css directories from the original Marinelli theme directory into my sub-theme directory.

I believe that what is going on here is that when the original page.tpl.php file runs in a sub-theme directory, it assumes that the /js files and the /css files in the original theme will also be in the sub-theme, but, since I got it working anyway, I haven't had time to go any further.