Google Chrome和Safari中的背景图片问题

Here is my CSS:

这是我的CSS:

#menu {
    float: left;
    background: url(images/menu_normal.jpg) repeat-x bottom;
}

#menu li {
    display: inline;
    float: left;
    height: 33px;
    line-height: 33px;
    text-align: center;
    width: 60px;
}

#menu li a:hover {
    display: inline;
    background: url(images/menu_hover.jpg) repeat-x bottom;
    float: left;
    height: 33px;
    line-height: 33px;
    text-align: center;
    width: 60px;
}
#menu {
    float: