function make_scrollable(wrapper, scrollable,btn_up,btn_down){
  var wrapper = $(wrapper), scrollable = $(scrollable), btn_up = $(btn_up), btn_down = $(btn_down);
  var wrapperHeight = wrapper.height();
  var scrollableHeight = scrollable.outerHeight();
  var spd = 5;  
  var interval;
  
  btn_up.mouseover(function(e){
    do_scroll(-1);
  });
  btn_up.mouseout(function(e){
    clearInterval(interval);
  });
  btn_down.mouseover(function(e){
    do_scroll(1);
  });
  btn_down.mouseout(function(e){
    clearInterval(interval);
  });
  function do_scroll(dir){
    interval = setInterval(function(){
      var top = wrapper.scrollTop() + spd*dir;
      wrapper.scrollTop(top);
    }, 40);
  }
}
$(document).ready(function(){
  $("div#news_wrapper").before("<p id='news_scroll_up' class='news_scrollbutton'>▲</p>");
  $("div#news_wrapper").after("<p id='news_scroll_down' class='news_scrollbutton'>▼</p>");
	make_scrollable("div#news_wrapper", "div#news_wrapper ul.index" , "p#news_scroll_up" , "p#news_scroll_down");
		
  $("div#media_wrapper").before("<p id='media_scroll_up' class='news_scrollbutton'>▲</p>");
  $("div#media_wrapper").after("<p id='media_scroll_down' class='news_scrollbutton'>▼</p>");
	make_scrollable("div#media_wrapper", "div#media_wrapper ul.index" , "p#media_scroll_up" , "p#media_scroll_down");
});