function checkdata()
{
	
for (var i=0; i < document.transfer.departure.length; i++)
   {
   if (document.transfer.departure[i].checked)
      {
      var dep = document.transfer.departure[i].value;
      }
   }
for (var i=0; i < document.transfer.transfer_from.length; i++)
   {
   if (document.transfer.transfer_from[i].checked)
      {
      var t_from = document.transfer.transfer_from[i].value;
		   
	      }
   }
   if(dep=='two' && t_from=='town'){
   alert('You can not take round trip from the town.');
   document.transfer.departure[1].focus()
   return false;
   }

     return true;

}