.img {
   display: block;
   float: left;
   background-image:url("http://howwhoreach.com/uploads/projeto_exp1.png");
   width:189px;  /* Tamanho das partes 189x189 */
   height:189px;
   border: 0px solid #ccc;
}

.parte1 {
  background-position: 0 0;
}

.parte2 {
   background-position: -189px 0;
}

.parte3 {
   background-position: -378px 0;
}

.parte4 {
   background-position: 0 -189px;
}
.parte5 {
   background-position: -189px -189px;
}
.parte6 {
   background-position: -378px -189px;
}