.back {
background-attachment: fixed;
background-image: url(images/viaje1_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back2 {
background-attachment: fixed;
background-image: url(images/vamosatabasco_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back3 {
background-attachment: fixed;
background-image: url(images/rutadelcafe_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back4 {
background-attachment: fixed;
background-image: url(images/tabascoychiapas_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back5 {
background-attachment: fixed;
background-image: url(images/tourdechiapas_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back6 {
background-attachment: fixed;
background-image: url(images/chiapasecoturistico_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back7 {
background-attachment: fixed;
background-image: url(images/losmayasylaselva_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back8 {
background-attachment: fixed;
background-image: url(images/rutachiapas_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back9 {
background-attachment: fixed;
background-image: url(images/memoriasmayas_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back10 {
background-attachment: fixed;
background-image: url(images/chiapasyguatemala_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back11 {
background-attachment: fixed;
background-image: url(images/chiapasyyucatan_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back12 {
background-attachment: fixed;
background-image: url(images/chiapas3dias_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}

.back13 {
background-attachment: fixed;
background-image: url(images/chiapas4dias_3.jpg);
background-repeat:  no-repeat;
background-position: left top;
}
.gradient {
background-attachment: scroll;
background-image: url(images/back_home.jpg);
background-repeat:  repeat;
background-position: left top;
}