$(document).ready(function() {
    
    
    
    $(window).scroll( function(){
            
        $('.show1').each( function(i){
            
            var bottom_of_element = $(this).offset().top + $(this).outerHeight();
            
            var bottom_of_window = $(window).scrollTop() + $(window).height() + 500 ;
            
            if( bottom_of_window > bottom_of_element ){
        $(this).removeClass('fade');
            }
            
        }); 
        
          $('.show2').each( function(i){
            
            var bottom_of_element = $(this).offset().top + $(this).outerHeight();
            
            var bottom_of_window = $(window).scrollTop() + $(window).height() + 500 ;;
            
            if( bottom_of_window > bottom_of_element ){
        $(this).removeClass('fade');
            }
            
        }); 


     $('.show3').each( function(i){
            
            var bottom_of_element = $(this).offset().top + $(this).outerHeight();
            
            var bottom_of_window = $(window).scrollTop() + $(window).height() + 500 ;;
            
            if( bottom_of_window > bottom_of_element ){
        $(this).removeClass('fade');
            }
            
        }); 


     $('.show4').each( function(i){
            
            var bottom_of_element = $(this).offset().top + $(this).outerHeight();
            
            var bottom_of_window = $(window).scrollTop() + $(window).height() + 600 ;;
            
            if( bottom_of_window > bottom_of_element ){
        $(this).removeClass('fade');
            }
            
        }); 


     $('.show5').each( function(i){
            
            var bottom_of_element = $(this).offset().top + $(this).outerHeight();
            
            var bottom_of_window = $(window).scrollTop() + $(window).height() + 500 ;;
            
            if( bottom_of_window > bottom_of_element ){
        $(this).removeClass('fade');
            }
            
        }); 
        
       
    });
});