Need to Add ''Processing... Please Wait...'' Text to Appear

I am selling products through Clickbank to a Wishlist Member membership site. I have custom code to improve the user experience. When the user presses the "buy button" on the initial product and any product in the upsell funnel, the AJAX code is called and the user is then brought to the next page. **However, there is a 1-2 second delay after the button is pressed and the user can't easily tell if their click was processed - I don't want the user to be confused, so I would like to display a message that says: "Processing... Please Wait..."** I want this text to appear under the buy button immediately after they press it without any delay. This should be a pretty simple job. I need this fast, so if you want this job, please be ready to hop on a quick Skype call with me and then to start work right away. Also, to ensure that you read and understood this, please let me know your favorite color at the beginning of your job request. Thanks and I look forward to working with you!