// bpref = tab body prefix, hpref = tab header prefix
      function seltab(bpref, hpref, id_max, selected) {
        if (! document.getElementById) return;
        for (i = 0; i <= id_max; i++) {
          if (! document.getElementById(bpref + i)) continue;
          if (i == selected) {
            document.getElementById(bpref + i).style.visibility = "visible";
            document.getElementById(bpref + i).style.position = "";
            document.getElementById(hpref + i).className = "open";
            document.getElementById(bpref + i).style.display = "block";
          } else {
            document.getElementById(bpref + i).style.visibility = "hidden";
            document.getElementById(bpref + i).style.position = "absolute";
            document.getElementById(hpref + i).className = "close";
            document.getElementById(bpref + i).style.display = "none";
          }
        }
      }
    //