you can use the css property pointer-events: none;
as well.
#karte .flag {
pointer-events: none; /*Added line*/
position: absolute;
background: url('http://static.netzwelt.de/farcade/images/capturetheflag1.gif') no-repeat;
width: 50px;
height: 50px;
top: 200px;
left: 50px;
}
Here is the Demo http://jsfiddle.net/9Br6h/2/.