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, 12000); 
   //time in milliseconds 
   $('#scrollup').hover(function() { 
     clearInterval(headline_interval); 
   }, function() { 
     headline_interval = setInterval(headline_rotate,12000); //time in milliseconds 
     headline_rotate(); 
   }); 
}); 

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; 
}