body
{
    margin:4px;
}

img.preload 
{ 
     display: none; 
}


.uno 
{
	text-align:center;
        border:4px solid black;	
        background-color:#000000;
}
.dos
{
	text-align:center;	
        border-bottom:4px solid black;
        background-color:#000000;
}
.tres
{ 
	vertical-align:top;
	text-align:center;
        border-right:4px solid black;	
        background-color:#000000;
        color:#ffffff;
}
.tres img  
{
        border:4px solid black;	
}
.cuatro
{
    padding-left: 40px;
    padding-right: 40px;
    padding-bottom: 40px;
    vertical-align: top;
    width:740px;
}


ul {list-style-type: none;}
#btn1{background: #9c9 url('/imagenes/btninicio.jpg');}
#btn2{background: #9c9 url('/imagenes/btnlohecho.jpg');}
#btn3{background: #9c9 url('/imagenes/btnporhacer.jpg');}
#btn4{background: #9c9 url('/imagenes/btnagenda.jpg');}
#btn1:hover{background: #9c9 url('/imagenes/btninicio2.jpg');}
#btn2:hover{background: #9c9 url('/imagenes/btnlohecho2.jpg');}
#btn3:hover{background: #9c9 url('/imagenes/btnporhacer2.jpg');}
#btn4:hover{background: #9c9 url('/imagenes/btnagenda2.jpg');}


.linklohecho img
{
    border:0px solid red;
}