php - problems with links and submit buttons on a FB app in some browsers -

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i'm developing fb application php. it's working browsers.

however there problem when press image link or button, happens entire page reloads , stays in same page. if i'm in index.php , link it's set next.php, page reloads , continues in index.php. happens in ie 9, weird thing happens in firefox of friend of mine uses same version on mac (i tested in pcs , worked fine in on firefox, chrome , opera).

this problem happened in safari to, able solve change relative urls absolute urls, problem still persists on ie , appears on firefox...

i valided code in http://validator.w3.org/. i'm using win 7.

any or suggestions in it's welcome, @ point i'm clueless.

here's code:

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <?php session_start();  $_session = array();  require_once "configuration/config.php";  $friends = $facebook->api('me/friends');  if(count($friends['data']) < 20)     header('location: https://tratamentoquedadecabelo.com/diogo/notenough.php');  $query_user_participant = "select id user id = $fb_user_id , participant = 1";  $query_minimum_answers = "select * survey_answers user_has_friend_user_id = $fb_user_id";  $res_query_minimum_answers = mysql_query($query_minimum_answers);  $res_query_user_participant = mysql_query($query_user_participant);  if($res_query_user_participant == true && mysql_num_rows($res_query_minimum_answers) > 19) {     //user did study     header('location: https://tratamentoquedadecabelo.com/diogo/studyalreadydone.php'); }  ?>  <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">      <head>         <meta http-equiv="content-type" content="text/html;charset=utf-8" />         <title></title>         <link rel="stylesheet" type="text/css" href="css/style.css" />     </head>     <body>         <div id="fb-root"></div>         <script src="https://connect.facebook.net/en_us/all.js"></script>         <script type="text/javascript">             fb.init({             appid : '********************',             status : true, // check login status             cookie : true, // enable cookies allow server access session             xfbml : true // parse xfbml             });         </script>      <script type="text/javascript">         fb.canvas.setsize({ width: 800, height: 715 });     </script>         <br/>         <h2 id="lang_title">choose language</h2>             <div id="british">                 <a href="https://tratamentoquedadecabelo.com/diogo/startpage.php?language=british">                      <img class="effect" src="https://tratamentoquedadecabelo.com/diogo/images/british.jpg" width="200" height="150" alt="british_flag" /></a>             </div>             <div id="portuguese">                 <a href="https://tratamentoquedadecabelo.com/diogo/startpage.php?language=portuguese">                      <img class="effect" src="https://tratamentoquedadecabelo.com/diogo/images/portuguese.jpg" width="200" height="150" alt="portuguese_flag" /></a>              </div>     </body> </html>

solved problem internet explorer writing line of code @ start of file:

header('p3p:cp="idc dsp cor adm devi taii psa psd ivai ivdi coni our ind cnt"');

the problem default ie not allow third party cookies. more here. so, if user manually disables third party cookies kind of problems persist.


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