function ShowPopup(event, filename) {
    var img = document.getElementById('popupImage');
    img.setAttribute("src", filename);
    img.style.visibility = "visible";
    img.height = 200;
}
function HidePopup(event) {
    var img = document.getElementById('popupImage');
    img.style.visibility = "hidden";
    img.style.left = 1;
    img.style.top = 1;
    img.setAttribute("src", "");
}
function MovePopup(event) {
    var img = document.getElementById('popupImage');
    img.style.position = "absolute";

    if (event.clientX > document.documentElement.clientWidth - img.width - 10)
        img.style.left = event.x - img.width - 10 ;
    else
        img.style.left = event.x + 10;


    if (event.clientY > document.documentElement.clientHeight - img.height - 10)
        img.style.top = event.y - img.height - 10;
    else
        img.style.top = event.y + 10;

}