$(this) not working in jquery $.POST

[arctushar]

<script type="text/javascript">
    $("div #search_ayat_div").click(function(){
    var link1='?verse=';
    var link2=$(this).html();
    link=link1.concat(link2);
    link=link.replace(":","/");
    window.location.replace(link);
});
    $("div #bookmark").click(function(){
    var messageid = $(this).parent().children("#search_ayat_div").html();
    var div_id=$(this).attr('id');
    $.post("command.php",{
        command:'bookmark',
        verse:messageid
    },function(result){
        if(result=='yes'){
                            $(this).css({
                    "border":"medium solid #FF0000"
                });
            alert("Successfully Bookmarked");
        }
        if(result=='no'){
            alert("Already Bookmarked");
        }
    });
});
</script>

Here at line 17 $(this) is not working. Remember there multiple #bookmark div in the page.
is there any solution.
thank u

[pritaeas]

Store it in a variable before the post, and use that.