Develop Function in Ruby+Watir-Webdriver+Chrome

We have test a website using ruby + watir-webdriver + google chrome. Several tests must be done behind a proxy. Proxy needs authentication (usar/password). The problem: There are a programatically way to setup the IP:PORT of the proxy for Google Chrome, but not to set up the user/password. Google Chrome open a popup askin user/password when the user starts browsing behind the proxy. But we need to automate the whole process. We are looking for a programmer who can solve this issue, and develop two functions: ConnectProxy(IP, PORT, USER, PASSWORD) DisconnectProxy() For more information, please read these articles: [login to view URL] [login to view URL] [login to view URL]