i want to pass my php variable in one javascript function.

i know it seems simple but i don't know where am i missing something?

    <?php

        while($gg=mysql_fetch_array($lg))

        {

    ?>

        <td id=add_td>

        <?php

        $id = $gg['p_id'];

        echo <a onclick=cnf('Are you sure you want to delete that?',$id)>; ?>Delete</a>

        </td>

<?php

        }

?>

and in my javascript function

function cnf(msg,id)

{



     cnf = confirm(msg);

     if(cnf) { 

            parent.location.href = 'p_update.php?d=' + id;          

     }

}

so i need to know on which id that user had clicked so that i will only delete that id from database.

if i try this thing then it showing error on cnf function and its saying like unterminated string literal?