window.onload = rotate;

var slideImages = new Array("images/slide1.jpg","images/slide2.jpg","images/slide3.jpg","images/slide4.jpg","images/slide5.jpg","images/slide6.jpg","images/slide7.jpg","images/slide8.jpg","images/slide9.jpg","images/slide10.jpg");

var thisSlide = 0;

function rotate() {
     thisSlide++;
     if (thisSlide == slideImages.length) {
        thisSlide = 0;
     }
     document.getElementById("showslide").src = slideImages[thisSlide];

     setTimeout("rotate()", 3 * 1000);
}