function getDomain()
{
var pageurl=top.document.location+''; 
var domain="";
if(pageurl.indexOf(".etiantian.com")!=-1)
  domain="etiantian.com";
else if(pageurl.indexOf(".etiantian.net")!=-1)
  domain="etiantian.net";
else if(pageurl.indexOf(".crtc.etiantian.com")!=-1)
  domain="crtc.etiantian.com";
else
  domain="etiantian.com";
return  domain;
}