function show_submenu(num){

document.all.submenu1.style.display='none';
document.all.submenu0.style.display='none';
document.all.submenu3.style.display='none';
document.all.submenu4.style.display='none';
document.all.submenu5.style.display='none';
document.all.submenu6.style.display='none';
document.all.submenu7.style.display='none';

  switch (num) {
	case 1:
	  document.all.submenu1.style.display='';
	  break;
	case 2:
	  document.all.submenu2.style.display='';
	  break;
	case 3:
	  document.all.submenu3.style.display='';
	  break;
	case 4:
	  document.all.submenu4.style.display='';
	  break;
	case 5:
	  document.all.submenu5.style.display='';
	  break;
	case 6:
	  document.all.submenu6.style.display='';
	  break;
	case 7:
	  document.all.submenu7.style.display='';
	  break;
  }
  return false;
}