a.navbar-brand:hover img {
    filter:alpha(opacity=70);
    -moz-opacity: 0.7;
    opacity: 0.7;
    -khtml-opacity: 0.7;
}
 
a.navbar-brand img {
    filter:alpha(opacity=100);  
    -moz-opacity: 1.0;  
    opacity: 1.0;
    -khtml-opacity: 1.0; 
}


a.redes:hover img {
    filter:alpha(opacity=70);
    -moz-opacity: 0.7;
    opacity: 0.7;
    -khtml-opacity: 0.7;
}
 
a.redes img {
    filter:alpha(opacity=100);  
    -moz-opacity: 1.0;  
    opacity: 1.0;
    -khtml-opacity: 1.0; 
}