function getStyle(el, style) {
    if (!document.getElementById) return;

    var value = el.style[style];

    if (!value)
        if (document.defaultView)
        value = document.defaultView.
                 getComputedStyle(el, "").getPropertyValue(style);

    else if (el.currentStyle)
        value = el.currentStyle[style];

    return value;
}