addClass cant turn on the plugin

[tals]

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:

    $('.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:

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

    setInterval (function (){            $('#girl').attr('class', 'gallery-slideshow');    }, 600);

but its not working.

html:

               <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

[tals]

sorry for the double, but i really need help.

[ReFreezed]

You must execute the .cycle function after you've added the gallery-slideshow class to the #girl element.