function przelacz(f) {
          if (navigator.appName=="Microsoft Internet Explorer"
              && navigator.userAgent.indexOf("Opera")==-1) {
            typ = "block";
          } else {
            typ = "table-row";
          }
          if(f==0) {
              if (document.getElementById("r0-0").style.display=="none") {
                document.getElementById("r0-0").style.display=typ;
                document.getElementById("r1-0").style.display=typ;
                document.getElementById("r0-1").style.display="none";
                document.getElementById("r1-1").style.display="none";
                document.getElementById("r0-2").style.display="none";
                document.getElementById("r1-2").style.display="none";
              } else {
                document.getElementById("r0-0").style.display="none";
                document.getElementById("r1-0").style.display="none";
              }
          }  else if(f==1){
              if (document.getElementById("r0-1").style.display=="none") {
                document.getElementById("r0-1").style.display=typ;
                document.getElementById("r1-1").style.display=typ;
                document.getElementById("r0-0").style.display="none";
                document.getElementById("r1-0").style.display="none";
                document.getElementById("r0-2").style.display="none";
                document.getElementById("r1-2").style.display="none"
              } else {
                document.getElementById("r0-1").style.display="none";
                document.getElementById("r1-1").style.display="none";
              }
          }  else if(f==2){
              if (document.getElementById("r0-2").style.display=="none") {
                document.getElementById("r0-2").style.display=typ;
                document.getElementById("r1-2").style.display=typ;
                document.getElementById("r0-0").style.display="none";
                document.getElementById("r1-0").style.display="none";
                document.getElementById("r0-1").style.display="none";
                document.getElementById("r1-1").style.display="none";
              } else {
                document.getElementById("r0-2").style.display="none";
                document.getElementById("r1-2").style.display="none";
              }
          }        
        }