Jinno,
It's possible that Netscape 7.1 (and let me emphasize that Netscape is dead -- there will be no updates) adopted the "title" attribute instead of "alt". Things are supposed to be shifting from alt to title based on industry standards, but then again things are supposed to be shifting from tables to layers
I'll add the "title" attribute and perhaps that'll fix it. It will also make the page size larger than the 100k it already is!
I'm considering making the main page have the graph and vehicle aggregate statistics and then have subpages for the specific car tables.