Link back to main site

After having added Gallery to my own site, I am currently struggling with adding a Back link to it, so that a user can seamlessly return to the main page of the site. I do not want to have my regular menu bar showing up with the gallery, for reasons of real estate. Does anybody know how to add a Back link to Gallery? I have a feeling that it is something under my nose, but I cannot figure it out. Any help is greatly appreciated! Thanks.