Color Coded Gantt View in SharePoint 2010?

Hi Guys,

I'm trying to modify the bar color of task bars in a gantt view like described here (for SP 2007):

http://blog.pathtosharepoint.com/2009/09/08/color-coded-gantt-view/

My problem is, that there are different css-classes in SP 2010. It is very hard to use the ClientObjectModel (SPGantt.js, etc.) because it's not really documentated...

Any ideas?

Thank you in advance,

Björn