> http://magic.lib.uconn.edu/mash_up/usgs_topos.html
>    -supposed to default to the 1895 USGS

I only looked  at that one, but I'm totally suprised it's rendering
any kind of map at all.  Your map initialising script is running
inline in the middle of the HTML, in some browsers that will execute
before the DOM is fully constructed.

Look into 'onload' events or move script to immediately before </body>

You're calling for API v=1, you won't get it as that's long obsolete
but will be getting served version two instead.   Much, but not all,
old v=1 syntax is still supported. For now.  So you might want to
review the whole script in that light.

Version two is now highly modularised, unlike v1, and will cause
different timing behaviours when loading pages.  If you take care to
ensure things happen in teh right order e.g. by using 'onload' type
events that doesn't cause a problem, but might explain your page has
seemed to work (maybe for some users, in some browsers) up till now.

You seem to be doing a lot of activity before the map gets centered
for the first time.  That's bad practice, as the first centering
initialises the map properly.

cheers, Ross K

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