Well, not everyone in Thailand (and anywhere in the world) would agree with the coup. The protest has just begun. There are hundreds of protesters in business district area of Bangkok. Here is another way, online petition.
http://www.petitiononline.com/thaicoup/petition.html
The petition was initiated by Thongchai Winichakul, a professor of history at the University of Wisconsin-Madison.
[Source: the Nation, September 23, 2006]