a) What is your Apex URL? Paste starting from "http" to the /apex/ at the end
If it has /pls/ in it it means you are on OHS. If no /pls/ then it could be EPG or ApexListener.
b) Did you deploy a .war file during installation on Tomcat/Glassfish/etc then you are using ApexListener.
c) When you installed apex you must have copied the images from the distribution to the webserver. How did you do that? The target images folder is your /i/
You can use the -Dapex.images option to specify the location of the /i/ folder when you start the listener. See http://download.oracle.com/otn/java/appexpress/1.1/docs/AELIG/E21058_01.pdf?AuthParam=1335511857_7d29a62f879dafd8db03bc31c33c270f Page 14.