/* 	::

	:: File 		: styles.css
	:: About 		: Your stylesheet file

:: */
img-contato {
    opacity: 0.5;
    filter: alpha(opacity=50); /* For IE8 and earlier */
}

img-contato:hover {
    opacity: 1.0;
    filter: alpha(opacity=100); /* For IE8 and earlier */
}