[jQuery] how i can access classes in my div?

[jQuery] how i can access classes in my div?


how i can access classes in my div?
example:
$("#box1.bloc-top").click(function () {
     $(".bloc-center").slideToggle("slow");
});
$("#box2.bloc-top").click(function () {
     $(".bloc-center").slideToggle("slow");
});
$("#box3.bloc-top").click(function () {
     $(".bloc-center").slideToggle("slow");
});
<div id="box1" class="box">
<bloc-top>content top</bloc-top>
<bloc-center>content slideToggle</bloc-center>
</div>
<div id="box2" class="box">
<bloc-top>content top</bloc-top>
<bloc-center>content slideToggle</bloc-center>
</div>
etc..
i tryed this it but no success