before running tomcat in eclipse it was showing. but now nor external tomcat home page is running nor eclipse's internal though on giving full path of file of any application it is perfectly fine.
eclipse has modified the server.xml of your tomcat. Sorry to say that, but I don't think that there is a way to restore your orig. configuration. You should not use a TC that is used for other than devevlopment purposes from within eclipse.
You can configure if eclipse should modify you installation or not in the server settings in eclipse.