function loch(what) {
 if(what==1) {
  document.getElementById("lochbig").className="";
  document.getElementById("lochsmall").className="nod";
  document.getElementById("lochfotobig").className="nod";
  document.getElementById("lochtext").className="nod";
  }
 if(what==2) {
  document.getElementById("lochbig").className="nod";
  document.getElementById("lochsmall").className="";
  document.getElementById("lochfotobig").className="nod";
  document.getElementById("lochtext").className="";
  }
 if(what==3) {
  document.getElementById("lochbig").className="nod";
  document.getElementById("lochsmall").className="nod";
  document.getElementById("lochfotobig").className="";
  document.getElementById("lochtext").className="nod";
  }
 }