div#header-left{
  width:200px;
  height:110px;
  background: url(../bilder/kopf_1.gif) no-repeat;
  float:left;
}

div#header-center{
  width:620px;
  height:110px;
  background: url(../bilder/kopf_2.gif) no-repeat;
  float:left;
}

div#header-right{
  width:160px;
  height:110px;
  background: url(../bilder/kopf_3.gif) no-repeat left;
  float:right;
}