function moveElement(elementID, final_x, final_y, interval) {
    if (!document.getElementById) return false;
    if (!document.getElementById(elementID)) return false;
    var elem = document.getElementById(elementID);
    if (elem.movement) {
        clearTimeout(elem.movement);
    }
    if (!elem.style.left) {
        elem.style.left = "0px";
    }
    if (!elem.style.top) {
        elem.style.top = "0px";
    }
    var xpos = parseInt(elem.style.left);
    var ypos = parseInt(elem.style.top);
    if (xpos == final_x && ypos == final_y) {
        return true;
    }
    if (xpos < final_x) {
        var distance = final_x - xpos;
        var jump = Math.ceil(distance/10);
        xpos = xpos + jump;
    }
    if (xpos > final_x) {
        var distance = xpos - final_x;
        var jump = Math.ceil(distance/10);
        xpos = xpos - jump;
    }
    if (ypos < final_y) {
        var distance = final_y - ypos;
        var jump = Math.ceil(distance/10);
        ypos = ypos + jump;
    }
    if (ypos > final_y) {
        var distance = ypos - final_y;
        var jump = Math.ceil(distance/10);
        ypos = ypos - jump;
    }
    elem.style.left = xpos + "px";
    elem.style.top = ypos + "px";
    var repeat = "moveElement('" + elementID + "'," + final_x + "," + final_y + "," + interval + ")";
    elem.movement = setTimeout(repeat, interval);
}

function addClass(element, value) {
    if (!element.className) {
        element.className = value;
    }
    else {
        newClassName = element.className;
        newClassName += " ";
        newClassName += value;
        element.className = newClassName;
    }
}


function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    }
    else {
        window.onload = function() {
            oldonload();
            func();
        }
    }
}


function insertAfter(newElement, targetElement) {
    var parent = targetElement.parentNode;
    if (parent.lastChild == targetElement) {
        parent.appendChild(newElement);
    } else {
        var next = targetElement.nextSibling;
        parent.insertBefore(newElement, next);
    }
}