table.alta {
height: 100%}

table.d752{
height: 752px;
}
td.uno {
 background-image: url('images/bg_02.gif');
 background-position: right top;
}
td.dos {
 background-image: url('images/bg_left2.gif');
 background-repeat: repeat-x;
 background-position: right top;
}
td.tres {
 background-image: url('images/bg_01b.gif');
 background-repeat: repeat-y;
 background-position: left top;
 width: 766px;
}
td.cuatro {
 background-image: url('images/bg_right.gif');
 background-repeat: repeat-x;
 background-position: left top;
}