var present_slide=0;

var images = new Array('images//kerze.jpg', 'images//slide//infrarotheizung-holz.jpg', 'images//slide//bildheizung.jpg', 'images//slide//velvet.jpg');


objImage = new Image();

function download(img_src){
// preload the image file
    objImage.src=images[img_src];
}


function displaynext(shift){
    present_slide=present_slide + shift;


    if(images.length > present_slide && present_slide >= 0){
    //document.images[''im''].src = images[present_slide];
        document.images['im'].src = images[present_slide];

        var next_slide=present_slide + 1;
        download(next_slide); // Download the next image 
        setTimeout('displaynext(1)', 5000); 
    }
    else{
        present_slide = -1;
        displaynext(1);
    }

    if(present_slide+1 >= images.length ){
        present_slide=images.length-1;
    }

    if(present_slide<=0 ){
        present_slide=0;
    }
}