function rotate(objId, degrees) {

    if (objId == null) return;
     
    var obj = document.getElementById(objId);

    if (obj !== null && obj.style !== null) 
    {
        var rotateStyle = 'rotate(' + degrees + 'deg)';
        obj.style['-webkit-transform'] = rotateStyle;
        obj.style['-moz-transform'] = rotateStyle;
        obj.style['transform'] = rotateStyle;
    }
}