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';

}
}