<script type='text/javascript'>
$(function(){
//Keep track of last scroll
var lastScroll = 0;
$(window).scroll(function(event){
//Sets the current scroll position
var st = $(this).scrollTop();
//Determines up-or-down scrolling
if (st > lastScroll){
//Replace this with your function call for downward-scrolling
alert("DOWN");
}
else {
//Replace this with your function call for upward-scrolling
alert("UP");
}
//Updates scroll position
lastScroll = st;
});
});
</script>
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