Question: Firefox Related

I dont know if something is wrong with my blog or not…
https://erica.purplekisses.org
When you click on the navigation stuff (ie. me, site) they are supposed to open in a small box.
Well, when I use Firefox and do it, it comes up with an error…
“Attempt to load a javascript: URL from one host
in a window displaying content from another host
was blocked by the security manager.”
but when I use IE, its just fine.
Is something wrong with my blog? Or does Firefox just have something wrong with it?
Thanks!