.weakvisionimg {
    opacity: 0.7;
    filter: alpha(opacity=40);
}

.weakvisionimg:hover {
    opacity: 1.0;
    filter: alpha(opacity=100);
}
#goTop {
    background-color: rgba(255, 255, 255, 0.75);
  	border-radius: 4px;
  	font-size: 20px;
  	color: #333;
    padding: 5px 20px;
    position: fixed;
    top: -100px;
    left: 20px;
  	box-shadow: 0 0 4px rgba(0,0,0,0.5);
  	cursor: pointer;
    z-index: 5;
}

#goTop span img {
	opacity: 0.5;
        filter: alpha(opacity=50); /* For IE8 and earlier */
        width: 30px;
}