you can only use 1609 if that's the port that VS started the ASP.Net dev environment under - do you know how to see the port being currently used? It's in the HIDDEN ICONS taskbar thingy for me on my Windows 7 machine...

At any rate - - poke around and create an IMAGES folder up or down from the folder it's looking for and see if you can at least get the image to be found.

Also - if you use FIREBUG you can see the actual path being attempted by the tcpip call.