                     case NavigationUnit.UP:
                     {
                         proposedNewIndex = selectedIndex - 1;  
-                        event.preventDefault()
+                        event.preventDefault();
                         break;
                     }                      
         
                     case NavigationUnit.DOWN:
                     {
                         proposedNewIndex = selectedIndex + 1;  
-                        event.preventDefault()
+                        event.preventDefault();
                         break;
                     }
                         

                    {
                        proposedNewIndex = selectedIndex == -1 ? 
                                            -1 : Math.max(selectedIndex - PAGE_SIZE, 0);
                        event.preventDefault()                                    
                        break;
                    }
                        
                    case NavigationUnit.PAGE_DOWN:
                    {    
                        proposedNewIndex = selectedIndex + PAGE_SIZE;
                        event.preventDefault()
                        break;
                    }
                       
                    case NavigationUnit.HOME:
                    {
                        proposedNewIndex = 0;
                        event.preventDefault()
                        break;
                    }

                    case NavigationUnit.END:
                    {
                        proposedNewIndex = dataProvider.length - 1;  
                        event.preventDefault()
                        break;
                    }  
                       

        }
        else
        {
            event.preventDefault();
        }
        
    }
