#eins {
background-color:#000;
background-image:url(../images/01.jpg);
width:252px;
height:77px;
position:relative;
opacity:100.0;
filter:alpha(opacity=100);}

#zwei {
background-color:#000;
background-image:url(../images/02.jpg);
width:252px;
height:77px;
position:relative;
opacity:0.0;
filter:alpha(opacity=0);}