PNG and DOM

Two hopefully invisible changes today, but scream if anything breaks:

• I've changed the map to generating PNGs by default instead of GIFs. This is to work around a bug in embedded WebKit (seen in the Second Life Viewer 2.0 Beta) where it may not display GIFs correctly.
• I've rewritten the event handling code for the map to more correctly manage DOM events, in both the W3C and IE models. This is to try and make dragging work correctly in the IE9 Platform Preview (I'll test tomorrow), clean up the code (this was my first interactive web site!), and as a side effect it fixes mouse wheel support in Chrome.

I've tested in IE8, Safari (Win), Firefox 3.6 (Win), Chrome 4 (Win), and Opera 10 (Win). Looks good, but I'm nervous and ready to roll back if anyone sees any issues.

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Minor tweaks

Nothing big, just for reference:

• I've been correcting the routes for Dagudashaag as Signal GK issues are appearing online.
• Malorn data has been refreshed from BeRKA's copy
• I tweaked the glyphs used for bases and the font used on the map (slightly narrower now)
• I validated the links on the info page - unfortunately, many older sites are dropping offline.

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