function show_hide(the_layer, x)
{
  if(document.getElementById(the_layer))
  {
    if(document.getElementById(the_layer).style.display == 'none')
    {
      document.getElementById(the_layer).style.display = 'block';
    }
    else
    {
      document.getElementById(the_layer).style.display = 'none';
    }
  }

  //hide the other opened submenus
   var objSubMenu; 
   if (the_layer != 'menusub_2') {
       objSubMenu =  document.getElementById('menusub_2');
       if (objSubMenu) {
            objSubMenu.style.display = 'none';
       }
   } 
   if (the_layer != 'menusub_3') {
       objSubMenu =  document.getElementById('menusub_3');
       if (objSubMenu) {
            objSubMenu.style.display = 'none';
       }
   } 
   if (the_layer != 'menusub_4') {
       objSubMenu =  document.getElementById('menusub_4');
       if (objSubMenu) {
            objSubMenu.style.display = 'none';
       }
   } 
   if (the_layer != 'menusub_5') {
       objSubMenu =  document.getElementById('menusub_5');
       if (objSubMenu) {
            objSubMenu.style.display = 'none';
       }
   } 

}