how to preview an image before upload in various browsers

Question

I want to show preview of an image before it is uploaded. I have found a partial solution that works for ie6 and firefox, and havent yet tested it in ie7 or ie8. But i want

Answer 1

This will be a serious security issue if done. You can't have a preview of a file in the users computer. You have to upload the file to the server and can show the preview of the file after it is successfully uploaded.