Orange.mu has been marked as a potential source of malware by Google.
As far as I know, the site was accessible (without the warning) yesterday at around 11am.
There might be various reasons behind this, the webmasters need to investigate. Google provides more details about this error on the site here. It seems that a trojan is behind all this mess.
I went through this phase a few months back when my personal web site www.yashvinawootar.com had been marked as a potential source of malware.
I posted a thread in the Google Webmaster Central to get some help because I simply had to idea how to fix it. The error came from a “scriptaculous.js” script. The guys there are really great and helpful!
Good luck to Orange.mu and don’t hesitate to contact the guys in the forum!
Update on 12 September 2010
At 10am today, Orange.mu was back to the normal. No more malware warning!