The second parameter (second item in each of the parentheses) is the version of the button to display after the event (the mouse rolling over the first image) has taken place, and so, onMouseover ...

The image probably isn't loaded by that time. I mean, it's probably a couple milliseconds, if that, between when you assign that src and when you ask for the width and height.

Now, developer Kee Hinckley along with the folks at Somewhere Inc. have created an enhanced perl script that will take any entered URL and convert the entire page (including any images, JavaScript ...

I think Google is now ignoring the "static" version (before the javascript runs) and just evaluates the "final" (rendered) version. For articles, I embed resized images that link directly to full ...