"There are three main difficulties that an inexperienced developer faces when trying to understand JavaScript as used in Drupal:

1. The lack of documentation,
2. The OOP style of programming,
3. The confusion between all the different elements and API involved

"
Complete article at Drupal API

Blessings!

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Let me talk about the history(hehe)
I was webmaster of somesite.com from october 2006 to march 2007.
In January 2007, my new boss wanted to port current home made CMS to a solid platform.
My boss choice was Java, using JBoss(I still smile when remember). I've made research by 3 weeks...
Drupal was the winner, core+community comply at least 80% of full somesite.com functionalities,
the other missing had to be just 2 months of customization and integration of special funcionalities, then the theme and final testing.

One day after its launch, Wine team was able to run Safari for Windows XP/Vista, look at this screenshot.
As an alternative you can try Konqueror (that uses WebCore based on KHTML) or, until they fix wine to get Safari running OK, try with BrowsrCamp.
Anyway, now web developers(me too!) have to test AJAX under Internet Explorer, Firefox, Opera and Safari!!! r_r
Blessings!