Testing preloadResource with callback/timeout capabilities

Successfully tested browsers: ^*

• Safari 5, 4.0.5, 3.2.1, 3.1.2, 3.0.4
• Opera 10.60, 10.50, 10.10, 9.64, 9.50
• Firefox 3.6, 3.5, 3.0
• Chrome 5
• Internet Explorer 8, 7, 6, 5.5

^* where "successful" means that load/error event fires when loading resource, and that timeout callback works as expected.

Known failures:

• Firefox 1.x, 1.5.x, and 2.x — load event on OBJECT element never fires
• Safari 2.0.4 — load event on OBJECT element never fires