change layout

[Brickan]

Hi
i wonder if ther any way to use use Avalanche css layout?
i dont have the source left, just a old bakup from the file server
i just want the body to use
something lite this

.back_1_1 {
width: 24px;
height: 18px;
}
.back_1_2 {
background: url(images/1_2.gif);
width: 34px;
height: 18px;
}
.back_1_3 {
background: url(images/1_3.gif);
height: 18px;
}
.back_1_6 {
background: url(images/1_6.gif);
width: 34px;
height: 18px;

Is this hard ? i dont have that much webmaking skill

thanks

Brickan