I do not know whether this is the right place for me to ask this question. But this is very urgent to me. I am running a website that was used "oscommerce" as my shopping cart. I hope you guys know" oscommerce". It is a shopping cart system to build a on line shop like Zencart. Then I found something really strange to the URL when I checked in Google webmaster tool. There are many duplicate contents on my site. Then I found that the reason is the URL. Here is the normal and correct URL below In order to let thing simple, I will mark the below URL like as"1" "2" "3" 1. http://www.mydomain.com/motion-detection-mini-dv-car-video-record-infrared-function-p-777.html Then this one is really strange as below: 2. http://www.mydomain.com/motion-detection-mini-dv-car-video-record-infrared-function-pi-777.html and also this one is really let me creazy as below: 3. http://www.mydomain.com/motion-detection-mini-dv-car-video-record-infrared-function-pr-777.html I click the Second URL, then I was loaded to a page showing me the image. then the product review page when click on the third URL. Because of all of the page have the same title, then the duplicate contents happen. My question is that How can I cancel the second and third URL and forbid Google to index it?