Does anyone know how to upload files from client to server machine using AJAX.

I would appreciate some sample codes. Im trying to use AJAX to upload an attachment from a client to my server.

In addition to Javascript (and AJAX) you need to know a little bit of PHP to create a web page that receives the uploaded file and saves it to the web server. The other way would be WebDAV but that's going into very complex and largely uncharted territory and I would not suggest it. Sorry, but that's all the advice I can give you right now without opening up my programming section of the brain. If you want I'll write the PHP script for you so you can just try to write the Javscript part.