onError, when a picture is broken..
If you see an alert, onError works.
```
works with NS3 thru NS4.5
IE too
```

onError, trying to replace the broken image with a healthy one

does not work with NS4.5, but it should methinks
ha! it does work with NS3, but crashes at reload
IE does it!

onError, when only the lowsrc is broken while the src is fine.
you should see an other alert saying "Broken LOWSRC"

NS3 - NS4.5:
	onError is triggered for broken lowsrc, too, and no
	SRC is loaded to fix it, even if the SRC is fine.
IE: onError is NOT triggered, SRC is loaded instead.

onError, with a valid lowsrc

NS4.5/Unix: If src is broken, but a valid lowsrc is given,
	    onError is not triggered - and no picture is shown! Bug!
NS3: onError is triggered
IE: onError is triggered, and no picture is shown! Wrong, too!

onAbort, when loading a picture is interrupted..
TODO