PHP code not working with Contact form -


i created contact form in php file , working fine standalone php file code, made bootstrap. validates data, sends mail , working fine. please have look:

http://shahsaad.webuda.com/php/contactform.php

the problem is, when try include in main page in different aboutus.php file, php code doesnt work. please take @ this:

http://shahsaad.webuda.com/aboutus.php

as can see not working. put php code on top of else in page. supposed put somewhere else? tried putting in body doesn't work either. please me out.

my php code entered on top of page:

<?php  if($_post["submit"]) {        if(!$_post["name"]) {          $error = "<br />please enter name.";      }      if(!$_post["email"]) {          $error.="<br />please enter email.";      }      if(!$_post["comment"]) {          $error.="<br />please enter comment or query.";      }      if ($_post["email"] , !filter_var($_post["email"], filter_validate_email)) {          $error.="<br />please enter valid email address.";      }       if($error) {          $result ='<div class="alert alert-danger"><strong>error: </strong>'.$error.'</div>';      } else {      if (mail("shahsaad@msn.com", "comment website!", "name: ".$_post['name']."         email: ".$_post['email']."         comment: ".$_post['comment'])) {         $result='<div class="alert alert-success"><strong>thank         you!</strong>we in touch.</div>';     } else {          $result ='<div class="alert alert-danger">sorry there error sending message. please try again later.</div>';          }      } }       ?> 

my css

<style>      .navbar-brand {          font-size:1.7em;      }      #topcontainer {         background-image:url("background.jpg");         height:auto;         width:100%;         background-size:cover;      }     #toprow{         margin-top:100px;         color:white;        }     #toprow h1{         font-size:300%;        }     .rounddiv{         border-radius:10px;         background-color: #ffffff;           opacity:0.5;         color:black;     }     .margintop{         margin-top:30px;     }     .centerdiv{         text-align:center;      }     .title {         margin-top:100px;         text-size:300%     }     a:hover {         text-decoration:none;     }     .col-md-4{         text-align:justify;     }     #footer {         background-color:#000000;         height:40px;         width:100%;         text-align:center;         color:#3777a0;     }     .testing{         width:100%;         padding-left:27px;         padding-bottom:20px;     }     #emailform {      border:1px solid grey;     border-radius:8px;     margin-top:10px;     background-color:#5486a8;     color:white;     }      textarea.form-control {          height:130px;     }     #contactform {          padding-bottom:20px;     }   </style> 

my html body

<body>        <div class="navbar navbar-inverse navbar-fixed-top">          <div class="container">              <div class="navbar-header">                  <button class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">                 <span class="icon-bar"></span>                 <span class="icon-bar"></span>                 <span class="icon-bar"></span>                 </button>                  <a href="" class="navbar-brand">soon valley</a>              </div>              <div class="collapse navbar-collapse">                  <ul class="nav navbar-nav">                      <li><a href="">photos</a><li>                     <li><a href="">videos</a><li>                     <li><a href="">notes</a><li>                     <li><a href="aboutus.php" class="active">about us</a><li>                  </ul>                  <form class="navbar-form navbar-right">                      <div class="form-group">                         <input type="email" placeholder="email" class="form-control"/>                     </div>                      <div class="form-group">                         <input type="password" placeholder="password" class="form-control"/>                     </div>                      <button type="submit" class="btn btn-success">sign in</button>                  <form>              </div>          </div>      </div>      <div class="container contentcontainer" id="topcontainer">          <div class="row">          <div class="col-md-6 col-md-offset-3" id="toprow" id="emailform">              <h1>leave message..</h1>              <?php echo $result; ?>               <p class="lead">question, comment or concern? our contact form best way in touch us.</p>              <form method="post" id="contactform">                  <div class="form-group">                      <label for="name">your name</label>                     <input type="text" name="name" class="form-control" placeholder="your full name" value="<?php echo $_post['name']; ?>"/>                  </div>                  <div class="form-group">                      <label for="email">your email</label>                     <input type="email" name="email" class="form-control" placeholder="your email" value="<?php echo $_post['email']; ?>"/>                  </div>                  <div class="form-group">                      <label for="comment">your comment</label>                     <textarea name="comment" class="form-control"><?php echo $_post['comment']; ?></textarea>                  </div>                  <input type="submit" name="submit" class="btn btn-success btn-lg" value="submit"/>              </form>          </div>      </div>             </div>      <div class="container" id="bottomlinks">          <div class="row">              <div class="col-md-4">                 <a href="">                 <h2><span class="glyphicon glyphicon-picture"></span> photo gallery</h2>                 </a>                 <p>a brief description of photo gallery, , more details fill space                 know.a brief description of photo gallery, , more details fill space                 know.</p>               </div>              <div class="col-md-4">                 <a href="">                 <h2><span class="glyphicon glyphicon-facetime-video"></span> videos</h2>                 </a>                 <p>a brief description of photo gallery, , more details fill space                 know.a brief description of photo gallery, , more details fill space                 know.</p>              </div>              <div class="col-md-4">                 <a href="">                 <h2><span class="glyphicon glyphicon-list-alt"></span> notes</h2>                 </a>                 <p>a brief description of photo gallery, , more details fill space                 know.a brief description of photo gallery, , more details fill space                 know.</p>              </div>          </div>      </div>      </div>      <div class="container" id="footer">          </p>designed by: <a href="http://www.facebook.com/shahsaad"><b>shah saad hamadani</b></a>      </div>    <!-- jquery (necessary bootstrap's javascript plugins) --> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>  <!-- latest compiled , minified javascript --> 
<script>      $(".contentcontainer").css("min-height",$(window).height());   </script>