div {
  position:absolute; 
  width:130px; 
  height:64px;
  visibility:hidden;
  text-align:left;
}
#a1 {
  left:64px; 
  top:16px; 
}
#a2 {
  left:258px; 
  top:16px; 
}
#a3 {
  left:452px; 
  top:16px; 
}
#a4 {
  left:646px; 
  top:16px; 
}

#b1 {
  left:64px; 
  top:128px; 
}
#b2 {
  left:258px; 
  top:128px; 
}
#b3 {
  left:452px; 
  top:128px; 
}
#b4 {
  left:646px; 
  top:128px; 
}
#c1 {
  left:64px; 
  top:240px; 
}
#c2 {
  left:258px; 
  top:240px; 
}
#c3 {
  left:452px; 
  top:240px; 
}
#c4 {
  left:646px; 
  top:240px; 
}
#d1 {
  left:64px; 
  top:352px; 
}
#d2 {
  left:258px; 
  top:352px; 
}
#d3 {
  left:452px; 
  top:352px; 
}
#d4 {
  left:646px; 
  top:352px; 
}
#e1 {
  left:64px; 
  top:464px; 
}
#e2 {
  left:258px; 
  top:464px; 
}
#e3 {
  left:452px; 
  top:464px; 
}
#e4 {
  left:646px; 
  top:464px; 
}