// JScript File
var timer;
function beginScrollDown(itemId) {
    timer = setInterval("scrollTop('" + itemId + "', 3)",30);
}
function beginScrollUp(itemId) {
    timer = setInterval("scrollTop('" + itemId + "', -3)",30);
}
function scrollTop(itemId, change) {
   document.getElementById(itemId).scrollTop = 
   document.getElementById(itemId).scrollTop + change;
}
function endScroll() {
    timer = clearInterval(timer);
}