$(document).ready(function(){
    $("input.wage_type").click(changeWageType);
});


var changeWageType = function(){
    var wageType = $("input[name=wage_type]:checked").val();
    var hourlyWage = $("#hourly_wage");
    if(wageType == "月給"){
        $("#yen").text("万円");
        hourlyWage.attr("maxlength","2");
    }else{
        $("#yen").text("円");
        hourlyWage.attr("maxlength","4");
    }
}