you are correct - if you are going to overlay images, then they must be
on the same projection. Re-projecting an image on the fly is costly (and
degrades the image quality), and beyond what a browser running JS can do
in reasonable time. Geoserver can do on-the-fly reprojection of image
sources but that doesnt solve image quality issues (and is expensive on
server cpu resources). You want to look hard at how the image was
created in the first place. If it is photographic or similar, then
offline reprojection to 900913 using high-quality (cpu-intensive)
options is best path. If it originated from vector data, then go back to
the original vector data and use a WMS server to deliver it in the
desired projection on the fly.
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