Hi thanks for the replys.

However, I am not sure that this is the problems since I am using

#menu li a:hover

ie hover as a pseudo of a.

Also it worked perfectly before I put it within the context of the rest of the header (ie the menu worked fine on its own) and only appeared to screw up when I put the containers and so on in as well. Also I find that sometimes the menus work, and sometimes they don't - it all seems a bit erratic...