var currentCell;

var currentMenu;



function showMenu(theCell,menuName,area) {



   //reset colours to the current area, new cell to its colours

   if (currentCell != null)

      currentCell.className = 'nav' + area; 

   theCell.className = 'nav' + menuName;



   // save current cell

   currentCell = theCell;



   // know which menu we are dealing with

   if (currentMenu == null) currentMenu = area;



   if (document.layers) {

      document.layers[currentMenu].visibility = 'hide';

      document.layers[menuName].visibility = 'show';

   } else if (document.all != null) {

      document.all[currentMenu].style.visibility = 'hidden';

      document.all[menuName].style.visibility = 'visible';

   }



   currentMenu = menuName;

}



function changePage(newPage) {

   document.location.href = newPage;

}