Change web.config to NOT show password when connecting to a SQL Server Database

Hi
I have a web application which connects to a SQL Server database and I use this line in the web.config

    <<add key="ConnectionString" value="Server=sppgpo05;UID=intranet;PWD=password;database=myDB;"/>

Now on my database under 'Security \ Logins' I have 'intranet'

This all works fine but I wish to not have the users password in the web.config.

I've setup a domain user 'mydomain\intranet'

so the question is how do I change the line in my web.config?

thanks!