function mouse_over(list_item) {

   list_item.style.backgroundImage='url(Images/round_g.png)';

 }

 function mouse_out(list_item) {

   list_item.style.backgroundImage='url(Images/round.png)'; 

 }

 function follow_link(link_id) {

   var anchor;

   anchor = document.getElementById(link_id);

   window.location = anchor.href;

 }