switch(location.host){

case 'www.zg-dh.com':
location.href="http://www.zg-dh.com/czh/"
break;

}

switch(location.host){
case 'www.65521033.com':
location.href="http://www.65521033.com/czh/"
break;

}
switch(location.host){
case 'www.cuizhanhai.com':
location.href="http://www.cuizhanhai.com/czh/"
break;

}