Why did I drop a pagerank on my website?

[Mets486]

My contact us page is still a 1. However my homepage went from a 1 to a 0. The only thing I have changed is that I added keywords where there were none and filled in a title section. Someone please help, http://www.lugedoctor.com ...Oh, and sometimes the home page url reads www.lugedoctor.com/ amnd sometimes it reads www.lugedoctor.com/index.html, why index?

[aug m]

You may be selling links