Eclipse Help version 3.3 includes breadcrumbs (trails of links) by default. If you do not want this navigation feature, you can disable it.
To disable breadcrumbs, find the file named:
org.eclipse.help.webapp\advanced\breadcrumbs.css
and replace its contents with:
...help_breadcrumbs { display: none; }
Including anchors in TOC entries also disables Eclipse Help native breadcrumbs, but might interfere with other features; see §21.4.3.3 Enabling mid-topic jumps from the TOC.