I wasn't suggesting that you hardcode www.google.com into the body of your email, I was suggesting that you use google to find examples of how to use cl_bcs. Try clicking http://lmgtfy.com/?q=class+cl_bcs+examples
The body of the email can be built programmatically, so you can easily create a dynamic URL, different for each email.
You'll need to create an HTML document. I'm kind of assuming here that the basics of ABAP are understood by you, so that with the information I've given you you'll be able to write the program.
btw - please ignore the below answer - use of the FM is old - use the class CL_BCS and associated classes, as it is much better programming.