function getStyle(elem, name) {
    if (elem.style[name])
        return elem.style[name];
    else if (elem.currentStyle)	//ie
        return elem.currentStyle[name];
    else if (document.defaultView && document.defaultView.getComputedStyle) {	//w3c
        name = name.replace(/([A-Z])/g, "-$1");
        name = name.toLowerCase();

        var s = document.defaultView.getComputedStyle(elem, "");
        return s && s.getPropertyValue(name);
    } else
        return null
}