#banners {
float:left;
text-align:left;
}

#banners a img
{
opacity:0.05; /* 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+*/
}

#banners a:hover img
{
opacity:0.1; -moz-opacity:1.0; filter:alpha (opacity=100);
}