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');
 
   
   $('#buttonnext').click(function() {
    headline_rotate_next();
   
   }, function() {
    
     headline_rotate_next();
   });


   $('#buttonprev').click(function() {
    headline_rotate_prev();

   }, function() {

     headline_rotate_prev();
   });
 });
 
 function headline_rotate_next() {
   current_headline = (old_headline + 1) % headline_count; 
   $("div.headline:eq(" + old_headline + ")").animate({top: -505},"slow", function() {
     $(this).css('top','600px');
   });
   $("div.headline:eq(" + current_headline + ")").show().animate({top: 5},"slow");  
   old_headline = current_headline;
   document.getElementById('buttonnext').style.visibility='hidden';
   document.getElementById('buttonprev').style.visibility='visible';
}
 function headline_rotate_prev() {
   current_headline = (old_headline + 1) % headline_count;
   $("div.headline:eq(" + old_headline + ")").animate({top: 505},"slow", function() {
     $(this).css('top','600px');
   });
   $("div.headline:eq(" + current_headline + ")").show().animate({top: 5},"slow");
   old_headline = current_headline;

   document.getElementById('buttonnext').style.visibility='visible';
   document.getElementById('buttonprev').style.visibility='hidden';
 }