.img_icono_1{
	width:60px;
    height:60px;
    border-radius:30px;
	cursor:pointer;
} 

.img_icono_1:hover{
	opacity: 0.5;
	filter: alpha(opacity=50);       /* IE8 and lower */
} 
/*
.img_icono_2{
	width:150px;
    height:150px;
    border-radius:75px;
} 

.img_icono_3{
	width:100px;
    height:100px;
    border-radius:50px;
} 
.img_icono_4{
	width:100px;
    height:100px;
    border-radius:10px;
	cursor:pointer;
} 
*/