function bg_a(prop)
   {
      prop.bgColor="#000000";
      prop.style.color="#FFFFFF";
      prop.style.cursor='hand';
      prop.style.border="1 solid #FFDF28";
   }
   function switchLink(URL){
     window.location.href = URL;
   }
   function bg_b(prop)
   {
      prop.bgColor="#999999";
      prop.style.color="#000000";
      prop.style.border="1 solid #FFDF28";   
   }  
   function bg_c(prop)
   {
      prop.bgColor="#C0C0C0";
      prop.style.color="black";
      prop.style.cursor='hand';
   }  
   function bg_c(prop)
   {
      prop.bgColor="#FFFFFF";
      prop.style.color="#C0C0C0";
   }