/* commons.js */

  function toggle_display(item_id) {
    var opt = document.getElementById(item_id);
    //item = document.all.item(item_d);
    var tname = opt.tagName.toLowerCase();
    var blocklist = new Array("blockquote", "div", "form", "pre", "ol", "table", "ul");

    d = opt.style.display;
    if (d == "none") {
      // look if item is a block element
      var isblock = false;
      for (t in blocklist) if (tname == blocklist[t]) { isblock = true; break; }; 
      opt.style.display = isblock?"block":"inline";
    } else {
      opt.style.display = "none";
    }
  }