When I edit a post in HTML and add an anchor to jump down the page, and then I switch back to Visual, and then switch back to HTML again, my anchors have been screwed with by WordPress. Sometimes the entire anchor tag is gone, sometimes WordPress moves them all to the top of the page, and sometimes the anchor remains but the text inside of it is now gone.
What do I need to do in order to get anchors working? I am making a site professionally and I need to be able to use this functionality (e.g. for a dictionary where at the top is "A", "B", "C", etc, and the user can click those links and it jumps down to the appropriate section). I want to hand over control to the person I'm making it for, but if using the Visual editor screws up anchors then I won't be able to. Help?