sstephenson/prototype — pull request #90 by jwestbrook (2012-12-28 21:55:22+00:00)
Title: IE8 fix for the opacity check

IE8 fails to set the `match` variable which throws a javascript error

```
'1' is null or not an object.
```
Check before `match` is used to prevent that from happening.

This was discovered by using script.aculo.us and running the `appear()` method on a div element. IE8 errored but other browsers did not.

Sorry about the mess - I think this should be the correct changes