#counters a img 
{
opacity:0.3; /* CSS3 - Mozilla 1.7b +, Firefox 0.9 +, Safari 1.2+, Opera 9 */
-moz-opacity:0.3; /* Mozilla 1.6 */
filter:alpha(opacity=40); /* IE 5.5+*/
}
 
#counters a:hover img
{
opacity:1.0; -moz-opacity:1.0; filter:alpha(opacity=100);
}