Scroll Down Button
.scrolldown {
background: url("img/icons.png") no-repeat scroll -13px -162px transparent;
width: 59px;
height: 31px;
display: block;
position: absolute;
bottom: 20px;
left: 50%;
margin-left: -30px;
cursor: pointer;
}
/* Scroll Down Button */
$('.scrolldown').click(function(){
$('html, body').animate({ scrollTop: $(this).parent().innerHeight() - 94}, 600);
return false;
});
<span class="scrolldown"></span>