javascript - Animate function not working on DIV -


i'm trying let div move off screen on screen... div should come down. i've tried stuff, unfortunately nothing happens :(. right div has position: absolute;?

please help.

html + jquery

<div id="nav">     <a href="#"><span>1</a>     <a href="#"><span>2</a>     <a href="#"><span>3</a>     <a href="#"><span>4</a>          <a href="#"><span>5</a> </div>  <div id="hidden">     <h1>text</h1>     <p>text</p> </div>  <script>     var main = function() {          $('#nav a:nth-child(1)').click(function() {             $('#hidden').animate({                 top: +=500px             }, 1000);         });     };     $(document).ready(main); </script>

css

    body {     background-image: url("http://static.tumblr.com/97f4b171db68d6ef1836c8fcb9a1c1a3/oi8jcug/xicn5vql3/tumblr_static_aajc47nn2ds8c0k004gskoo0c.jpg");     background-repeat: no-repeat;     background-size: cover;     padding: 0px;     margin: 0px; }  {     outline: none; }  #nav {     height: 50px;     line-height: 50px;     background-color: #1c1c1c;     font-size: 0px;     text-decoration: none;     width: 100%;     text-align: center;     font-family: sans-serif;     margin-bottom: none; }  #nav span {     display: inline-block;     font-size: 25px;     padding-left: 10px;     padding-right: 10px;     text-align: center;     border-right: 1px solid white;     height: 50px; }  #nav span:first-child {     border-left: 1px solid white; }  #nav span:hover {     border-bottom: 2px solid white; }  #nav {     color: white;     text-decoration: none;     margin: 0px;     padding: 0px; }  #hidden {     width: 100%;     height: 200px;     padding-left: 30px;     background-color: #1c1c1c;     color: red;     font-size: 10px;     top: -250px;     position: absolute; }

thank you, hydracles

change

    $('#nav a:nth-child(1)').click(function() {         $('#hidden').animate({             top: +=500px         }, 1000);     });

with

$('#nav a:nth-child(1)').click(function() {     $('#hidden').animate({         top: '+=500px'     }, 1000); });

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