.b1 { 
    width:70%;
    margin:0px auto; 
    background:#fff url(../img/ib_leftside.png) repeat-y left top;
}


.b1-top { 
    width:100%; 
    height:20px; 
    background:url(../img/ib_top.png) no-repeat left top; 
} 
.b1-top span { 
    display:block; 
    position:relative; 
    height:20px; 
    background:url(../img/ib_top-right.png) no-repeat right top; 
} 

.b1-main{ 
    position:relative; 
    background:url(../img/ib_rightside.png) repeat-y right top; 
    padding:1px 20px 1px 25px; 
    margin:-1px 0 -50px 0; 
} 


.b1-bottom { 
    height:60px; 
    background:url(../img/ib_bottom.png) no-repeat left bottom; 
} 
.b1-bottom span { 
    display:block; 
    position:relative; 
    height:60px; 
    background:url(../img/ib_bottom-right.png) no-repeat right top; 
}