Don't use relative URLs in your tags. use absolute URLs i.e. starting from /contextPath. You can add the context path to your URLs using either c:url JSTL tag or using ${pageContext.request.contextPath} EL before the actual URL...
Thanks. There is a second problem with relative paths, that if i prepend with / or ../ the appName gets cut from the URL. But i learnt my lesson, i will use struts 2s tags for it, especially since it seems to do some url rewriting as well.