#cad1 a {display:block; width:164px; height:115px; background: url("../buttons/btn_cad1.png") 0 0 no-repeat; border: 0px;	padding: 0px; margin: 0px;
}
#cad1 a:hover {background-position: -164px 0;
}
#cad1 a:active {background-position: -164px 0;
}

#cad2 a {display:block; width:164px; height:115px; background: url("../buttons/btn_cad2.png") 0 0 no-repeat; border: 0px;	padding: 0px; margin: 0px;
}
#cad2 a:hover {background-position: -164px 0;
}
#cad2 a:active {background-position: -164px 0;
}

#cad3 a {display:block; width:164px; height:115px; background: url("../buttons/btn_cad3.png") 0 0 no-repeat; border: 0px;	padding: 0px; margin: 0px;
}
#cad3 a:hover {background-position: -164px 0;
}
#cad3 a:active {background-position: -164px 0;
}

#cad4 a {display:block; width:164px; height:115px; background: url("../buttons/btn_cad4.png") 0 0 no-repeat; border: 0px;	padding: 0px; margin: 0px;
}
#cad4 a:hover {background-position: -164px 0;
}
#cad4 a:active {background-position: -164px 0;
}