ss_current = 0;

function ss_next() {
if (document.getElementById("ss_slide")[ss_current+1]) {
document.images.ss_show.src = document.getElementById("ss_slide")[ss_current+1].value;
document.getElementById("ss_slide").selectedIndex = ++ss_current;
}
else ss_first();
}

function ss_previous() {
if (ss_current-1 >= 0) {
document.images.ss_show.src = document.getElementById("ss_slide")[ss_current-1].value;
document.getElementById("ss_slide").selectedIndex = --ss_current;
}
else ss_last();
}

function ss_first() {
ss_current = 0;
document.images.ss_show.src = document.getElementById("ss_slide")[0].value;
document.getElementById("ss_slide").selectedIndex = 0;
}

function ss_last() {
ss_current = document.getElementById("ss_slide").length-1;
document.images.ss_show.src = document.getElementById("ss_slide")[ss_current].value;
document.getElementById("ss_slide").selectedIndex = ss_current;
}

function change() {
ss_current = document.getElementById("ss_slide").selectedIndex;
document.images.ss_show.src = document.getElementById("ss_slide")[ss_current].value;
}