Android Question Webview problem countdown javascript

hi i m trying to run this web on my webview
http://www.vallow.com.br/achouganhou/cronometro/

java script as enabled but the web is static
the countdown dont work

why this?

the contdown is made in javascript

i m using
cronometro.LoadUrl("http://www.vallow.com.br/achouganhou/cronometro/")