Connecting Ubuntu to internet using Windows 8 as bridge?

[chapma]

I have a Dell Inspiron 660s running Windows 8.1, and I just did a full boot of Ubuntu 13.10 onto a Dell Optiplex 330 that was previously running Windows XP.
My goal is to connect to the internet by using the 660s as a bridge to the internet by connecting the two computers with an ethernet cable.
The level of difficulty: My internet requires you to log into it on a separate browser log in page similar to those in airports and other public Wi-Fi access points except that it requires a username and password to log in.
My theory is that if I first log in to the internet on my Windows machine then I can connect to it by simply opening a connection from the Ubuntu OS to the Windows OS.
Am I off track here or am I on the right track? Anyone know how to do this?

 

[MilesAhead]

I found this freeware easy to use: Edit - I think the first time I used it I had a null modem cable between the serial ports of 2 machines. The proxy server had a dialup connection. It was much easier to set up and use than ICS.

Network Downloads : Proxy /// AnalogX