Javascript, show div element when it appears on screen

im trying to build code than animates some divs when they appear with the help of this code
so far i have write this code

$(document).ready(function() {
    /* Every time the window is scrolled ... */
    $(window).scroll( function(){
        /* Check the location of each desired element */
        $('#art-1').each( function(i){
            var bottom_of_object = $(this).position().top + $(this).outerHeight();
            var bottom_of_window = $(window).scrollTop() + $(window).height();

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