document.addEvent("domready",function(e){
     $$(".rel-list-div").each(function(el){
          el.addEvent("mouseover",function(e)
          {
               this.tween("background-color","#444444");
          }
          );
          el.addEvent("mouseout",function(e)
          {
               this.tween("background-color","#222222");
          }
          );
     });
});