Yah google likes it if the words in your keyword tags are said in the page some where else.
you could have a var that u set in each page that would carry them over.
In the file thats including the file put..
$metakey = 'Bla, blah, blaah, ba, blaa';
Like on the header file put
<META NAME="KEYWORDS" CONTENT="<? echo $metakey; ?>