Mechanize timeout errors

I am using mechanize for scraping some urls.
page = agent.get(url)
puts “oops!!”

catches invalid urls etc. , but how to I handle timeout errors?
In particular this is the error I get :

request-header: accept => /
request-header: user-agent => WWW-Mechanize/0.5.1
/usr/local/lib/ruby/1.8/timeout.rb:54:in rbuf_fill': execution expired (Timeout::Error) from /usr/local/lib/ruby/1.8/timeout.rb:56:in timeout’
from /usr/local/lib/ruby/1.8/timeout.rb:76:in `timeout’

Could someone also point me to some urls that always timeout. I tried
writing an inifinite while loop to simulate similar timeout erros, but
that did not work (or maybe I hit Ctrl C too soon).

Appreciate the help. Thanks!