<?    
    include("connect.php");    
    $sql="select * from sampledb";    
    $res=mysql_query($sql) or die("query failed");    
    ?>    
<script type="text/javascript" src="scripts/jquery.js"></script>        
<script type="text/javascript">        
 function updateCheckVal() {         
     var valcheck = [];
     $('#checkbox :checked').each(function() {
       valcheck.push($(this).val());
     });
     $('#store_checkbox').val(valcheck)
  }
 $(function() {
   $('#checkbox input').click(updateCheckVal);
   updateCheckVal();
 });            
$(function(){                
  $("a.modify").click(function(){    
    var val = [];    
    $(':checkbox:checked').each(function(i){    
      val[i] = $(this).val();    
    });
    $("#deleted_id").val(val);
  page=$(this).attr("href");    
        $("#Formcontent").html("loading...").load(page);    
        return false;    
  });  
});
</script    
<form name="">    
<table width="100%" border="1" cellpadding="1" cellspacing="1">    
<thead>    
<tr bgcolor="#CCCCCC">    
<th></th>    
<th>ID</th>    
<th>Fullname</th>         
</tr>     
</thead>    
<tbody>    
<? while($row=mysql_fetch_assoc($res)){?>    
<tr>    
 <td id="checkbox"><input type="checkbox"  name="chk[]" class="chk" value=<?php echo $row["student_id"];?> ></td>    
 <td><?php echo $row["id"];?></td>    
 <td><?php echo $row["fullname"];?></td>    
</tr>    
<? }?>    
</tbody>    
</table>    
    <input type="hidden" name="store_checkbox" id="store_checkbox" value="">    
    <a href="formstudent.php?action=update&id=<?php echo $_POST["store_checkbox"]; ?>" class="modify">modify</a>        

I want to pass the checkbox value that is checked in something like this:

example :formstudent.php?action=update&id=1,

I am doing here is pass like this but does not work.

<a href="formstudent.php?action=update&id=<?php echo $_POST["store_checkbox"]; ?>" 

Anybody know how to do this?