.back {
background-attachment: fixed;
background-image: url(images/back1.jpg);
background-repeat:  repeat-x;
background-position: left top;
}

.back2 {
background-attachment: fixed;
background-image: url(images/DSC00832.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back3 {
background-attachment: fixed;
background-image: url(images/dsazul.jpg);
background-repeat:  repeat;
background-position: left top;
}

.back4 {
background-attachment: fixed;
background-image: url(images/DSC00832.jpg);
background-repeat:  repeat;
background-position: left top;
}

.back5 {
background-attachment: fixed;
background-image: url(images/dsmorado.jpg);
background-repeat:  repeat;
background-position: left top;
}
.back6 {
background-attachment: fixed;
background-image: url(images/dsrojo.jpg);
background-repeat:  repeat;
background-position: left top;
}
.back7 {
background-attachment: fixed;
background-image: url(images/dsnaranja.jpg);
background-repeat:  repeat;
background-position: left top;
}