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<input type="button" id="button" onClick="ShowList();" value="Liste zeigen" />

<a href="javascript:void(0)" onClick="ShowList();"><img src="http://img247.imageshack.us/img247/8240/wwwstadtauscombtn450615ao5.png" onMouseOver="this.src='http://img90.imageshack.us/img90/1331/btn450615415vy3.png'"
onMouseOut="this.src='http://img247.imageshack.us/img247/8240/wwwstadtauscombtn450615ao5.png'" /></a>