function nav()
   {
   var w = document.waluty.waluty.selectedIndex;
   var url_add = document.waluty.waluty.options[w].value;
   window.location.href = url_add;
   }

function nav2()
   {
   var w = document.waluty2.waluty2.selectedIndex;
   var url_add = document.waluty2.waluty2.options[w].value;
   window.location.href = url_add;
   }