javascript to remove background from image

I want a tool to help the end user to remove the background from image The end user - that doesn't have knowledge of computation - will get the image and will remove the background from this image, like got a image from a model and remove entire model to get only the clothes I suggest to use [login to view URL] from [login to view URL] with some kind of lasso tool easy to end user use it but you are free to choose anything else to do that, I just won't accept a flash solution if the final solution will require a server background action it will be inside of a rails application