I was browsing around the web and I stumbled across something interesting (This isn't my product, it's a random 2checkout order page) https://www.2checkout.com/2co/buyer/purchase?sid=85565&quantity=1&product_id=83 Go to this page and view its source ... scroll down a bit and this is what you see: function [B][COLOR=RED]stop_tards[/COLOR][/B]( $this ) { $this.submit1.disabled = true; var response = confirm("Please select OK to process your order.\nThis process may take a few seconds\nPlease do not press the back or reload button,\ndoing so could result in double billing.\nSelect cancel to return to form."); if( response) { return true; } else { $this.submit1.disabled = false; return false; } } Code (markup): From what I can tell, it's some code to deal with people clicking the order button twice.