Jpg file caching issue. Optimization needed or poor settings?

'''- Step Naught''' - Boot Windows XP Pro SP3, on q6600 / 4Gb PC with /3G. Run Mozilla 3.6.10 and open two or three tabs to typical page: Google, TechDirt, Firefox Support.
'''- Step 1''' - Open a 4th tab, and load URL a containing a large jpg image. E.G., like one of the NASA .jpg files the from Hubble telescope page. Pick a hi-res image (> 72Kb). Often a large image triggers the zoom cursor to appear. This was my starting state.
'''- Step B''' - Surf that tab (with the .jpg) to a completely new domain, say, mozilla.com.
'''- Step III'' - Reload the previous page (with the .jpg). I don't recall here if I clicked the back button, or entered the page via its table of contents link.
'''- Step Last:''' Right-click to get image properties (sorry Macies), choose Save Image As, name and Save the file as directed.
'''- Result: ''' The image reloads via http: I sure would like the image to load from cache. Is this possible now? If so, what's the feature called? If it's not possible, this sounds like an easy optimization to make, albeit, low priority. What's the word?

Jey, we just installed:
Sun Java(tm) System Messaging Server 6.2 (built Dec 2 2004)
libimta.so 6.2 (built 00:34:23, Dec 2 2004)
SunOS urano1 5.9 Generic_118558-09 sun4u sparc SUNW,Ultra-4
And have the same problem with attached files: .doc,.xls,.ppt.
We have configured:
local.service.http.gzip.dynamic = 0
And IE tries to open a new window but close it rapidly. While presing CTRL the window open correctly.
The version installed previously did not have this problem:
Sun Java(tm) System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)
libimta.so 6.1 HotFix 0.02 (built 17:03:42, Aug 25 2004)
SunOS urano 5.9 Generic_118559-10 i86pc i386 i86pc
Is there any parameter to change and correct this problem?
Thanks

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