js

<div class="modalbox" id="modalbox">
          <div class="close"><p>X</p></div>
          <h2 style="text-align: center;">Заказ звонка</h2>
          <form id="myform">
              <input  type="text" class="youname" name="name" placeholder="Ваше имя" onblur="if (this.placeholder=='') this.placeholder='Ваше имя';" onfocus="if (this.placeholder=='Ваше имя') this.placeholder='';">
              <input class="youphone" name="phone" placeholder="Ваш телефон" onblur="if (this.placeholder=='') this.placeholder='Ваш телефон';" onfocus="if (this.placeholder=='Ваш телефон') this.placeholder='';">
              <input type="email" class="youname" name="email" placeholder="Ваш email" onblur="if (this.placeholder=='') this.placeholder='Ваш email';" onfocus="if (this.placeholder=='Ваш email') this.placeholder='';">
              <input type="submit" value="ОТПРАВИТЬ">
          </form>
          <div id="thankyou"><p>Спасибо, мы перезвоним</p></div>
      </div>