.look-picturebox { 
    overflow: hidden;
}

/** This uses absolute positioning and JavaScript to position the image at the correct alignment independently of
    the text Alignment.
    The absolute positioning works differently under Netscape and IE. Under IE, it is an offset from the client area
    of the button, and under NN it is an absolute position in screen space. We have different script functions for IE and NN
    to take care of those differences and make it appear correctly under both IE and NN
*/
.look-picturebox img {
    position: absolute; 
    left: 0;
    top: 0;
}