javascript - validate contact form with jquery and php -

i'm trying validate contact form jquery , php false php though it's working fine. i'm going explain code:
html:

<form method='post'>      <label>name<input id="name" type="text" name="name" /></label>      <label>email address<input id="email" type="text" name="email" /></label>      <label>subject<input id="subject" type="text" name="subject" /></label>      <label>message<textarea id="message" name="message"></textarea></label>      <label><input type="button" value="submit form" id="button_form" /></label>  </form>  

this js code:

function validaform(){     // campos de texto     if($('#email').val() == ""){         alert("you must fill in @ least email field.");         $('#email').focus();         return false;     }      return true; }  $('#button_form').click( function() {              if(validaform()){                                           $.post("php/form.php",$('form').serialize(),function(res){                 if(res == 1){                     alert("your e-mail has been sent, thank contacting us. answer possible.");                  } else if(res == 0){                     alert("sorry, e-mail couldn't been sent, please try again later.");                  } else {                     alert("others.");                 }             });         }     });  

this .php file:

<?php require 'class.phpmailer.php';  $mail = new phpmailer();  $mail->issmtp();                                      $mail->host = 'smtp.domain.com';   $mail->smtpauth = true;                               $mail->username = 'myacc@mydomain.com';                             $mail->password = 'pass';                           $mail->smtpsecure = 'tls';                              $mail->from = 'myacc@mydomain.com'; $mail->fromname = 'contact form'; $mail->addaddress('myacc@mydomain.com');                 $mail->addattachment('/var/tmp/file.tar.gz');          $mail->addattachment('/tmp/image.jpg', 'new.jpg');     $mail->ishtml(true);                                    $mail->subject = $_post['subject'];  $mensajefinal = "message";  $mail->body    = $mensajefinal;  if(!$mail->send()) {     return false; } else {     return true;     };  ?>  

ok, working fine, mean, sends e-mail problem false php file no matter if sends or not e-mail.
doing wrong?? there missing??
appreciate help. thanxs lot.

you have use echo here, not function. return used returning result functions. remove ; after

else {...};           ^  if(!$mail->send()) {     echo false; } else {     echo true;     }