/ Published in: JavaScript
                    
                                        
                            
                                Expand |
                                Embed | Plain Text
                            
                        
                        Copy this code and paste it in your HTML
 <script type="text/javascript"> window.onbeforeunload = function(e){ return 'En fermant cette page vous perdrez tout.'; } </script>
Comments
                    Subscribe to comments
                
                