toISOString() only works in Firefox

```
What steps will reproduce the problem?
var d = new Date().toISOString();
alert(d);

What is the expected output? What do you see instead?
2009-08-06T23:59:44.535Z
JavaScript error

What version of the product are you using? On what operating system?
Internet Explorer 8, Opera 9.64, Google Chrome 2.0.172.39 and Safari 4.0.2
on Vista.

Please provide any additional information below.

Message: Object doesn't support this property or method
```

Original issue reported on code.google.com by `robbins0...@gmail.com` on 7 Aug 2009 at 12:07