Re: any web designers here?
LINK REL=StyleSheet HREF="$CSSName" TYPE="text/css" MEDIA=aural>
$CSSName is the name of your CSS file you want to use. You can use it on the fly. This is PHP way of doing it, but I also tried it and you can do the similar thing with JS.
Yea you can customize it too but for that you might have to keep the values in SESSION to show the same style all over the website. For this purpose i would recommend to build your page in components and associate style of each component in CSS. It will be easier to do it this way.