// JavaScript Document

function change(key){
  var checks = document.getElementById("open" + key);
  if (checks.style.display== "none"){
    document.getElementById("open"+key).style.display = "block";
  }else{
    document.getElementById("open"+key).style.display = "none";
  }
}

function err(){
  var box = document.getElementById("shbox").value.length;
  if(box == 1){
    document.getElementById("error").display = "block";
    document.getElementById("error").innerHTML = "<p>※キーワードは2文字以上入力してください</p>";
    return false;
  }else if(box == 0){
    document.getElementById("error").display = "inline";
    document.getElementById("error").innerHTML = "";
    return false;
  }

}