var num=1

            img1 = new Image ()

            img1.src = "images/ceramics1.jpg"

            img2 = new Image ()

            img2.src = "images/ceramics2.jpg"

            function slideshow()

            {

                num=num+1

                if (num==3)

                        {num=1}

                document.mypic.src=eval("img"+num+".src")

            }