Untitled

<body onload="nextslide();">

function nextslide() {
    // Hide current slide
    var object = document.getElementById('slide' + current); //e.g. slide1
    object.style.display = 'none';

    // Show next slide, if last, loop back to front
    if (current == last) {
        current = 1;
    } else {
        current++;
    }

    object = document.getElementById('slide' + current);
    object.style.display = 'block';
    var timeout = setTimeout(nextslide, 2500);

    object.onmouseover = function(){
        clearTimeout( timeout );
    }
    object.onmouseout = nextslide;
}

object.onmouseout = function() {
    timeout = setTimeout(nextslide, 2500);
}