Reading custom data values in onclick

HTML

<img id="commentLike10" class="like likedislike" title="" alt="Arrow" src="http://localhost:3424/images/comment_like.png" data-cid="10">

JavaScript

$(document).ready(function(){
    $(document).on("click", ".like", function(evt) {
        LikeComment($(this).data("cid"));
    });
});

function LikeComment(cid) {
    alert(cid);
}