im working on some project, and i'm trying to turn on the gallery slideshow after "x" msec,
but when i'm adding the class, the cycle plugin just not working, the code:

jQuery:
HTML Code:
    $('.gallery-slideshow').cycle({
        fx:     'fade',
        speed:  'fast',
        timeout: 1000,  
        random: 1
    });
        


  setInterval (function (){        $('#girl').addClass('gallery-slideshow');    }, 600);
i also tried to add an attribute of class:

HTML Code:
    $('.gallery-slideshow').cycle({        fx:     'fade',        speed:  'fast',        timeout: 1000,          random: 1    });

    setInterval (function (){            $('#girl').attr('class', 'gallery-slideshow');    }, 600);
but its not working.

html:
HTML Code:
               <div class="gallery">            <div id="girl">                    <img src="../Images/gallery-imgs/1.jpg" alt="" />                <img src="../Images/gallery-imgs/2.jpg" alt="" />                <img src="../Images/gallery-imgs/3.jpg" alt="" />                <img src="../Images/gallery-imgs/4.jpg" alt="" />            </div>        </div>
i appreciate your help, thanks