bu scroll kodlarim

<script type="text/javascript">

    $(function(){
        var start = 0;
        var limit = 5;
        $(window).scroll(function(){
            if($(this).scrollTop() === $(".site").height() - $(window).height()){
                var mid = $(".id").last().attr("id");
                $.ajax({
                    type: "post",
                    url: "funksiya.php",
                    data: {
                        "mid": mid,
                        "start": start,
                        "limit": limit 
                    },
                    success: function(veri){
                        if(veri=='bos'){
                            
                        }else{
                            $(".contain").append(veri);
                            start+=limit;
                        }

                    }

                })
                
            }
            
        });
        
    })
</script>

bu da geri kalan kodlar

<script type="text/javascript">
$(function(){   
    $(".urek").click(function(){
        var urek = $(this);
        var id = urek.attr('id');
        alert(id);
    })
})

</script>

<?php

if($_POST){

$mid = $_POST['mid'];
$start = $_POST['start'];
$limit = $_POST['limit'];

$mehsul = $db->prepare("select * from mehsullar where id < $mid order by id desc limit $start,$limit");
$mehsul->execute();
$say = $mehsul->rowCount();

if($say > 0){
    while ($mehsulcek = $mehsul->fetch(PDO::FETCH_ASSOC)) {
        $id = $mehsulcek["id"]; ?>
        <span class="urek" id="<?php echo $id; ?>"><?php echo $id; ?></span> <?php
    } 
}else{
    echo 'bos';
}

}