Header & Logon Logo's

I'm running SD+ V5.
I cannot change the header & logon logo's. I've followed the procedure in the admin - General settings. I've copied my new image to the following directory.

E:\AdventNet\ME\ServiceDesk\applications\extracted\AdventNetServiceDesk.eear\AdventNetServiceDeskWC.ear\AdventNetServiceDesk.war\images\IDC_Logo.gif

What could be stopping the new image from appearing.