PHP sessions problems -

i'm using sessions save ever user types in form , ever type displayed on other pages.

it working fine after server uploads , such code has done 1 on me , i'm lost.

can see if can spot mistake? need fresh eyes.

html.

    <div id="form"><!--form start-->  <form action="home.php" method="post">      <p>enter name <input type="text" id="full_name" name="fullname"    class="name_input"/>  <input type="submit" name="submit"  value="submit" />  </p>      </form>      </div><!--form end--> 

php.

    <?php session_start(); // declaring variable  if(isset($_post['fullname'])){ //setting variable       if(empty($_post['fullname'])){ //if empty dont nothing wep page reload      }else{ //if have          $_session['fullname'] = $_post['fullname']; //get session name (from from)           header("location: home.php"); //then direct user home page (will display name on each page)     }}     ?> 

session on other pages

                  <div id="echo"> <!-- div echo start -->                                              <?php                      echo $_session['fullname']              ?>                               </div>  <!--div echo end -->     

$_session['fullname'] = $_post['fullname']; session_register(fullname); 

replace code try it