function checkForm(form) {

   if (form.fromcity.value=="") {
    alert ('Please fill in your departure city');
    form.fromcity.focus();
    return false;
   }

   if (form.tocity.value=="") {
    alert ('Please fill in your arrival city');
    form.tocity.focus();
    return false;
   }


   if (form.loccurrency.selectedIndex=="0") {
    alert ('Please choose your preferred currency');
    form.loccurrency.focus();
    return false;
   }

}