unable to control android emulator from novnc client in browser (chrome)

unable to control android emulator from novnc client in browser (chrome)

I have startup an android emulator with built-in qemu VNC server using
following command on OSX lion:
$emulator -avd avd_name -qemu -vnc :1
after that I want to able to control my emulator through my chrome browser
so I find noVNC (https://github.com/kanaka/noVNC)
$openssl req -new -x509 -days 365 -nodes -out self.pem -keyout self.pem
$./utils/launch.sh –vnc localhost:5901
the result is I can see the screen of android emulator but cannot control
the emulator from web browser (I use chrome) , where is the problem?