Confirm Message at Delete button

HTML Code:

<td><a onClick="return confirm('Are you sure you want to delete this record?')"
        href='view-emp.php?A=<?php echo $rec[0] ?>'><?php echo " $rec[2]" ?></a></td>

PHP Code:

<?php
if(isset($_GET['A']))
{
$P = $_GET['A'];
$A = mysql_connect("localhost","root","") or die ("error in sql connection");
    mysql_select_db("payroldb",$A) or die ("error in database");
    mysql_query("delete from tblemp Where ID=$P",$A) or die ("error in query");
    mysql_close($A);
}

?>