$(document).ready(function () { //this is on HTML ready
    $('#mainImage').fadeIn('slow');
}); //1. select the div using regular css, 2. set its initial opacity to 0, 3. fade it in

$(document).ready(function () { //this is on HTML ready
    $('#content').fadeIn('slow');
}); //1. select the div using regular css, 2. set its initial opacity to 0, 3. fade it in

$(document).ready(function () { //this is on HTML ready
    $('#footer').fadeIn('slow');
}); //1. select the div using regular css, 2. set its initial opacity to 0, 3. fade it in