How I target this FORM in this Section in jQuery for validation because I want custom validation and just target a SPAN tag for error message.. it is in BootStrap .. I am copying few tags here .. please guide !



Code:
  <section id="contact-form">
          <div class="container">
            <div class="row">
              <div class="col-md-6 col-sm-12">
                <div class="block">
                  <form action="" method="post" id="reg_form">
                    <div class="form-group">
                      <input type="text" class="form-control" placeholder="Your Name" id="fname">
                    </div>
                    <div class="form-group">
                      <input type="text" class="form-control" placeholder="Email Address" id="email">
                    </div>
                    <div class="form-group">
                      <input type="text" class="form-control" placeholder="Subject" id="subject">
                    </div>
                  </form>
                </div>
              </div>