Get the value from DropDown list [RESOLVED]

Ok guys maybe this way. Can you help me to get/save/remember <?=$milestone->id;?>, and post this to another id?
I have these numbers here

Code:

<?=$milestone->id;?>

in

Code:

<div class="row tab-pane fade" role="tabpanel" id="milestones-tab">

I have to save this in memory and transfer to this:

Code:

div class="row tab-pane fade" role="tabpanel" id="burndown-tab">

i could get this by:

Code:

            <?php if(isset($milestone)){  ?>
  <input id="id" type="text" name="id" value="<?php echo $milestone->id; ?>" />
<?php } ?>

But How to send it?