body{
	margin:0;
	padding:0;
}
 
a:hover img.hoverImg{
opacity:0.2;
filter:alpha(opacity=20);
-ms-filter: "alpha( opacity=20 )";
}

.bk{position:relative; width:860px; height:500px;}

#bt{position:absolute; top:36px; right:17px; width:205px; height:80px;}

#bt2{position:absolute; bottom:40px; right:268px; width:324px; height:54px;}