var headline_count;
var headline_interval;
var old_headline = 0;
var current_headline=0;

$(document).ready(function(){
 headline_count = $("div.headline").size();
 $("div.headline:eq("+current_headline+")").css('top','5px');

 headline_interval = setInterval(headline_rotate,5000); //time in milliseconds
 $('#scrollup').hover(function() {
   clearInterval(headline_interval);
       $('#scrollup').css('background-color','#E5E5E4');
 }, function() {
   headline_interval = setInterval(headline_rotate,5000); //time in milliseconds
   headline_rotate();
       $('#scrollup').css('background-color','#E5E5E4');
 });
});

function headline_rotate() {
 current_headline = (old_headline + 1) % headline_count; //remainder will always equal old_headline until it reaches headline_count - at which point it becomes zero. clock arithmetic
 $("div.headline:eq(" + old_headline + ")").animate({top: -205},"slow", function() {
   $(this).css('top','210px');
   });
 $("div.headline:eq(" + current_headline + ")").show().animate({top: 5},"slow");
 old_headline = current_headline;
}