Hi,
You're using features from WCF--introduced in .Net 3.0. To use 2.0, you will need to make changes to your web services. That's a huge subject (entire books are written about web services) and there is a lot of free stuff on the web regarding them.
Scott Mitchell is one of my favorite authors. He has a guide here that should be most useful:
http://www.4guysfromrolla.com/articles/062602-1.aspxGood luck,
Jon500