function menu_div_on(grupa){
     document.getElementById(grupa).style.display = "block";
     }

function menu_div_off(grupa){
     document.getElementById(grupa).style.display = "none";
     }

function f_action(typ){
     switch(typ){
          case "google":
          document.getElementById('main').action = 'http://www.google.pl/custom';
          break;
          
          case "informia":
          document.getElementById('main').action = 'index.php';
          break;
          }
     }