No, SiteGrinder uses Photoshop layer names to determine the role of the layer in the final HTML output.
So for example, if you have a Photoshop layer named "products" that you want to be a button, you name it "products-button" and SiteGrinder will take care of the rest when it converts the Photoshop file to HTML.
In SiteGrinder lingo those are known as hints. It's a pretty good system and there aren't too many: -button, -rollover, -popup, -hide, -popdown, -page, -merge, -rrect, -fav, -menu, -text, -scroll
I'm probably forgetting some, but those are the main ones. The -page hint is applied to a layercomp, not a layer. And the -merge hint is applied to layersets, not layers.
Chris
http://www.medialab.com/sitegrinder