[us...@httpd] apache cannot display images

Hi, I'm pretty new to apache , I haven't change httpd.conf much yet, just root directory changed. what happen is I put jpg file in root directory and try to c=access it via , www.somedomain.com/pic.jpg and I get url of file instead in firefox and in IE I get image not displayed thumbnail with

[us...@httpd] restrict virtualhost to certain type of files

Hi, does anyone know how to do this scenario : restrict virtual host to serve only files with the extensions html, jpg, and png. and also generate custom error msg if client request other type of files Jeremy