Customizing default error messages for HTTP in SAP Portal 7.3

Hi All

I want to show custom error pages for HTTP errors say 404, 500 etc. . I am referring following

  Changing the Look and Feel of the Default Error Pages 

http://help.sap.com/saphelp_nw73/helpdata/en/97/7f44560dd349d9b5f43181a19a5fed/content.htm?frameset=/en/97/7f44560dd349d9b5f43181a19a5fed/frameset.htm

We have got the property file errorPageFragments.properties inside jar sap.com~tc~je~httpserver~impl.jar
at \usr\sap\<sid>\<instanceid>\j2ee\cluster\bin\services\http\lib\private.

Query

1>> Where to place the new property file on server?

2>>what path to specify at ErrorPageTemplateLocation property for HTTP Provider service in NWA ?

Please guide how we can achieve this.

Regards,

Madhvika