AnFG....
Check out these sites for takeover info....
http://www.fido.gov.au/fido/fido.nsf/byheadline/Takeovers+info+for+shareholders?openDocument
http://www.swaab.com.au/publications/Introduction%20to%20Public%20Company%20Acquisitions%20-%202008.pdf
I doubt this is a takeover related trading halt,but I've been wrong before :))
Cheers