function checkform ( form )
{
  if (form.os0.value == "") {
    alert( "Please enter your Account # or Name." );
    form.os0.focus();
    return false ;
  }
  if (form.amount.value == "") {
    alert( "Please enter your Payment Amount." );
    form.amount.focus();
    return false ;
  }
  return true ;
}