Latest version and some errors

I can't figure out what advantages or disadvantages could each version have respect to the other. It seems that, in terms of performance, version 2 (equation_html) is better, so I'm going to put only that one into production.

However, I'm waiting the feedback of a LaTeX expert, so maybe I could change my opinion. I'll tell you if that happens.

Thanks and best regards.

PD: I don't know how difficult can it be, but I think that including into the Equation Editor the Google plugin which changes from SVG to flash ( http://code.google.com/p/svgweb/ ) would be a huge improvement, at least while Internet Explorer 9 is not still widely being used.