.cb-slideshow li:nth-child(1) span { 
    background-image: url(../images/background/1.jpg);
}
.cb-slideshow li:nth-child(2) span { 
    background-image: url(../images/background/2.jpg);
}
.cb-slideshow li:nth-child(3) span { 
    background-image: url(../images/background/3.jpg);
}
.cb-slideshow li:nth-child(4) span { 
    background-image: url(../images/background/4.jpg);
}
.cb-slideshow li:nth-child(5) span { 
    background-image: url(../images/background/5.jpg);
}
.cb-slideshow li:nth-child(6) span { 
    background-image: url(../images/background/6.jpg);
}
.cb-slideshow li:nth-child(7) span { 
    background-image: url(../images/background/7.jpg);
}
.cb-slideshow li:nth-child(8) span { 
    background-image: url(../images/background/8.jpg);
}
.cb-slideshow li:nth-child(9) span { 
    background-image: url(../images/background/9.jpg);
}