Javascript/||

function s1Func(){
  var s1Radio = document.getElementsByName("s1Radio");
  var s1Select = document.getElementById("s1Select");
  var s1Div = document.getElementById("s1Div");
  if(s1Radio[0].checked || s1Select[3].selected){
  	s1Div.innerHTML = "無料";
  } else {
  	s1Div.innerHTML = "1000円";
  }
}