Old laptops cannot run Windows XP.  Windows 98 cannot run IE7 nor
Chrome.

The "alpha" filter can control opacity for transparent GIFs but not
for transparent PNGs.  IE6 requires the "alphaImageLoader" filter to
display transparent PNGs .  It is incompatable with the "alpha"
filter.  You can use either one but not both.  "absolute postioning"
has nothing to do with it.

I have updated:

    http://www.polyarc.us/sparsetile.js

to avoid naming conflicts with the API's OverlayView prototype, also
to hide several support functions.

The file:

    http://www.polyarc.us/sparse

demonstrates the use of multiple unrelated tile sets.  The WMS "bbox"
parameters are generated automatically.  Unfortunately, the USGS OGC
server is frequently unavailable.
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