Watir: Facing problem with "IE.attach"

Hi,

I tried the following piece of code:

require ‘watir’

ie = Watir::IE.new
ie.attach(“www.yahoo.com”)

Getting the following error:

undefined method ‘attach’ for #Watir::IE:0x90edef0 (No Method Error)

I know the goto method and the start method can navigate me to the
desired url but what I want to do is this:

  1. I want to first check if there is any open browser already existing.
  2. If it exists, I want to attach a url to it.
  3. If it does not exist, then I want to create a new instance and
    navigate to the desired url using goto.

Can anyone please help me in getting this troubleshooted?

Thanks,
Anukul