Discoverer portlet - Location of images for page display

Can anyone tell me where the portlet provider knows where to find the images that appear (like the expand button image on the list of worksheets portlet).
If I look at the url in the page source , it is referencing http://<myserver>:7780/....
Is it hard coded somewhere?

Thank you for you reply. I have solved the problem after posting many topics on metlink and this forum. The problem that we had was after creating virtual hosts , the portlet provider seemed to update correctly except for the URL link to images on the HTML pages were pointing to the original host.
We had to manually edit the following configuration file (this was not documented anywhere however) and change the host C:\oracle\orabi\j2ee\OC4J_BI_Forms\config\oc4j.properties
#Fri Mar 18 17:49:55 GMT 2005
java.rmi.server.randomIDs=true
oracle.disco.activation.preferencePort=16001
oracle.path=%PATH%
oracle.home=C\:\\oracle\\orabi
oracle.forms.configFileName=C\:/oracle/orabi/forms/server/formsweb.cfg
oracle.discoverer.applications.port=7780
oracle.discoverer.applications.host=bi.portal.uk
Thanks for the reply

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