Problemas Classpath

Pessoal boa tarde como faço pra corrigir esse problemas?
obrigado.
Fábio Bufalari

Description Resource Path Location Type
Classpath entry C:/apache-tomcat-6.0.33/lib/servlet-api.jar will not be exported or published. Runtime ClassNotFoundExceptions may result. PoliciaMilitar P/PoliciaMilitar Classpath Dependency Validator Message

Description Resource Path Location Type
Build path specifies execution environment J2SE-1.5. There are no JREs installed in the workspace that are strictly compatible with this environment. PoliciaMilitar Build path JRE System Library Problem

Boa tarde, tente dar uma olhada nisso, talvez ajude você.
http://www.guj.com.br/posts/listByUser/15/107917.java
http://www.eclipse.org/forums/index.php/t/8738/
http://fstyle.de/hp_fstyle/wordpress/2008/06/18/classpath-entry-will-not-be-exported-or-published/
Boa sorte !!!