// 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";

    } else {

      document.getElementById(bpref + i).style.visibility = "hidden";

      document.getElementById(bpref + i).style.position = "absolute";

      document.getElementById(hpref + i).className = "close";

    }

  }

}