function PerformScroll(scrollValue) {
    scrollPos += scrollValue;
    var hdnText = document.getElementById("HiddenText");
    if (scrollPos < 10) {
        scrollPos = 0;
    }
    if (scrollPos > (hdnText.scrollHeight - hdnText.offsetHeight)) {
        scrollPos = (hdnText.scrollHeight - hdnText.offsetHeight);
    }
    document.getElementById("HiddenText").scrollTop = scrollPos;
}

function Scroll(scrollValue) {
    intervalId = setInterval("PerformScroll(" + scrollValue + ")", 50);
}

function CancelScroll() {
    if (intervalId != null) {
        clearInterval(intervalId);
        intervalId = null;
    }
}

var img1 = new Image(150, 92);
img1.src = "Images/block_01b.jpg";
var img2 = new Image(149, 92);
img2.src = "Images/block_02b.jpg";
var img3 = new Image(149, 92);
img3.src = "Images/block_03b.jpg";
var img4 = new Image(149, 92);
img4.src = "Images/block_04b.jpg";