Thanks, rowdie.
This is the debug message I got:-

Fatal error: Call to undefined function: newbb_notify_iteminfo() in /home/httpd/vhosts/alumni.usm.net.my/httpdocs/modules/newbb/post.php on line 193
Notice [PHP]: Undefined index: nosmiley in file modules/newbb/post.php line 174
Notice [PHP]: Undefined index: icon in file modules/newbb/post.php line 175
Notice [PHP]: Undefined index: attachsig in file modules/newbb/post.php line 176
Warning [PHP]: main(/home/httpd/vhosts/alumni.usm.net.my/httpdocsmodules/newbb/include/notification.inc.php): failed to open stream: No such file or directory in file modules/newbb/post.php line 192
Warning [PHP]: main(): Failed opening '/home/httpd/vhosts/alumni.usm.net.my/httpdocsmodules/newbb/include/notification.inc.php' for inclusion (include_path='.:/usr/share/pear') in file modules/newbb/post.php line 192

I have just installed XOOPS and I have problem with the News module. After postinga new news or replying, I got a blank and I have to use back button of browser to go back to my XOOPS site. Please help!