Your Tumblr is broken. Fix it.
While this solves the problem of getting "stuck" in the blog, you can do a lot more than just a link back to your homepageTumblr customization isn't that difficult -- and I think people with a basic understanding of HTML/CSS should be able to figure out how to do something like this.A large number of sites (including ours) have a top nav.We changed the whole top nav on our tumblr blog to look just like the rest of the site. The user can also access any part of our site this way.Take a look:http://darwinapps.com/
http://blog.darwinapps.com/