.ir{
      margin:0; padding:0;
      position:relative;
      height:40px;
      width:215px;
      overflow:hidden;
}

.ir span{
      display:block;
      position:absolute; left:0; top:0; z-index:1;
      margin:0; padding:0;
      height:40px;
      width:215px;
}

.ir span.imgNovinky{
      background:url("../images/news.png") top left no-repeat;
}

.ir span.imgDiskuze{
      background:url("../images/diskuze.png") top left no-repeat;
}

.ir span.imgSerialy{
      background:url("../images/rubriky.png") top left no-repeat;
}

.ir span.imgStudie{
      background:url("../images/studie.png") top left no-repeat;
}



.ir2{
      margin:0; padding:0;
      position:relative;
      height:40px;
      width:926px;
      overflow:hidden;

    color:#999999;
    background-color:#000;

}

.ir2 span{
      display:block;
      position:absolute; left:0; top:0; z-index:1;
      margin:0; padding:0;
      height:40px;
      width:926px;
}

.ir2 span.imgPodleJmena{
      background:url("../images/headers/architekturaPodleJmena.png") top left no-repeat;
}

.ir2 span.imgPodleTypu{
      background:url("../images/headers/architekturaPodleTypu.png") top left no-repeat;
}

.ir2 span.imgPodleOrganizace{
      background:url("../images/headers/architekturaPodleOrganizace.png") top left no-repeat;
}

.ir2 span.imgPodleDoby{
      background:url("../images/headers/architekturaPodleDoby.png") top left no-repeat;
}

.ir2 span.imgVeMeste{
      background:url("../images/headers/architekturaVLiberci.png") top left no-repeat;
}

.ir2 span.imgVOkoli{
      background:url("../images/headers/architekturaVOkoli.png") top left no-repeat;
}

.ir2 span.imgKartaStavby{
      background:url("../images/headers/kartaStavby.png") top left no-repeat;
}

.ir2 span.imgKartaAutora{
      background:url("../images/headers/kartaAutora.png") top left no-repeat;
}

.ir2 span.imgKartaOrganizace{
      background:url("../images/headers/kartaOrganizace.png") top left no-repeat;
}

.ir2 span.imgDiskuse{
      background:url("../images/headers/diskuse.png") top left no-repeat;
}

.ir2 span.imgSerialy{
      background:url("../images/headers/rubriky.png") top left no-repeat;
}

.ir2 span.imgSerial{
      background:url("../images/headers/rubriky.png") top left no-repeat;
}

.ir2 span.imgClanek{
      background:url("../images/headers/clanek.png") top left no-repeat;
}

.ir2 span.imgNovinky{
      background:url("../images/headers/novinky.png") top left no-repeat;
}

.ir2 span.imgstudie{
      background:url("../images/headers/studie.png") top left no-repeat;
}

.ir2 span.imgVyhledavani{
      background:url("../images/headers/vyhledavani.png") top left no-repeat;
}