#rechts {
  width: 1px;
}

#mitte {
  margin-right: 0px;
}

#inhalt_t {
  background-image:url(../images/inhalt_o_w.png);
}

#inhalt_m {
  background-image:url(../images/inhalt_m_w.png);
  width:540px;
}

#inhalt_b{
  background-image:url(../images/inhalt_u_w.png);
}