Compatibility for even older browsers

[Maingron]

Currently the script supports the following browsers:

Firefox 8 and later
Google Chrome 9 and later
Internet Explorer 9 and later
Safari 3 and later
Opera 12 and later

It should be possible to support even older browsers by finding (and checking, since the current alternative might be broken) other alternatives to window.addEventListener()

[Maingron]

The script works by spawning the images onload and if THEY're loaded, they trigger another onload which states that the images are supported. Haven't found another simple possibility yet. There are probably other solutions, but they're not simple enough to develop that in just one evening or so. Currently that's not worth it, I think. - About nobody uses browsers older than Firefox 8 and old Internet Explorer versions can't be used anyways on most websites anymore.