var slideshowspeed = 4000;
var tss;
var counter = 1;
var last_counter = 1;

function runslideshow(){
    var picture = "picture" + counter;

    var last_picture = "picture" + last_counter;
    eval("document.images." + last_picture + ".style").display = "none";
    last_counter = counter;

    eval("document.images." + picture + ".style").display = "block";
    counter++;
    if (counter > total) counter = 1;
    tss = setTimeout("runslideshow()", slideshowspeed);
}