jQuery class selector doesn't work and id selector works only with “body”

Question

I\'m trying to apply CSS values with jquery but class selector or id selector does not not work for some reason.

Here is my fiddle:

As you can see nothing happen

Answer 1

First you need do:

$("#kitten").css("background-position", x + "px 0");

Becouse you are not getting the Id selector.

And define a width and height to your div, to show your image like:

#kitten {
    background-image: url("http://sereedmedia.com/srmwp/wp-content/uploads/kitten.jpg");
    background-repeat: repeat-x;
    width: 390px; <----- LIKE this
    height: 200px; <----- LIKE this
}

DEMO