.izq {
	background-position: left;
	background-repeat: no-repeat;
}
.cen {
	background-position: center;
	background-repeat: no-repeat;
}
.der {
	background-position: right;
	background-repeat: no-repeat;
}
.sup {
	background-position: top;
	background-repeat: no-repeat;
}
.med {
	background-position: center;
	background-repeat: no-repeat;
}
.abj {
	background-position: bottom;
	background-repeat: no-repeat;
}.borde {
	border: 1px solid #999999;
}
.texto_plano {
	font-size: 10px;
	font-weight: bold;
	font-family: Tahoma, Arial, Helvetica, sans-serif;
	color: #FFFFFF;
}
.boton{
border:0;
cursor:pointer;
}