function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}


function showhide(id){
    if(document.getElementById){
      if(document.getElementById(id).style.display == "none")
        document.getElementById(id).style.display = "block";
      else
        document.getElementById(id).style.display = "none";
    }

  }

function show(id){
        document.getElementById(id).style.display = "block";
}

function hide(id){
        document.getElementById(id).style.display = "none";
}


function checkForm() {
var maxLen = 1000;// 最大文字数
if (document.mail_form.mail_text.value.replace(/\r|\n/g, "").length > maxLen) {
alert(maxLen + "文字以内で入力してください。");
return false;
}
else {
return true;
}
}