javascript - how to send in js file data to header.phtml file when click a link in magento? -

my js file:

$j('.language_eng').click(function(){        var lan = "eng";       $j.ajax({        url:"<?php echo $this->geturl('app/design/fontend/rwd/default/template/page/html/header.phtml') ?>",        type:'post',        data:{language:lan},        success:function(data){             alert(data);             location.reload();        }       });     }); 

my header.phtml file:

<?php $session = mage::getsingleton("core/session",  array("name"=>"frontend"));                  $language = $_post['language'];                 echo $language;                 // set data                $session->setdata("language",$language);                 // data                 $lang = $session->getdata("language"); ?> 

i think can't way. can't access phtml file via browser. templates part of controller/layout/block structure.