function redir(data) {_x000D_
document.getElementById('redirect').innerHTML = '<form style="display:none;" position="absolute" method="post" action="location.php"><input id="redirbtn" type="submit" name="value" value=' + data + '></form>';_x000D_
document.getElementById('redirbtn').click();_x000D_
}
_x000D_
<button onclick="redir('dataToBeSent');">Next Page</button>_x000D_
<div id="redirect"></div>
_x000D_
You can use this method which creates a new hidden form whose "data" is sent by "post" to "location.php" when a button[Next Page] is clicked.