i have created two website now i want one of them all url of web site do not end with .html how i can do it.please help me.
See this thread in the official Magento Forums:
Since your questions so far have all been about Magento, I can just once more suggest to register with the Magento Community. You will likely get much better answers there. They also have multi-language boards, so you can phrase your questions in your native language.
you can change configuretion to set which suffix include url and you can change to exclude it too.
System->configuration->catalog->search engine optimization