/* Wikispaces http://wikispaces.com/ Copyright 2005 Tangient LLC */

function display(id, ieattr, mozattr) { var b = document.getElementById(id); if (!b) return false; if (b.style.display == "none" || b.style.display == "") { if (navigator.userAgent.toLowerCase().indexOf('msie') + 1) { b.style.display = ieattr; } else { b.style.display = mozattr; } } else { b.style.display = "none"; } }
function opts() { o1 = document.getElementById('os1'); display('submenu1', 'inline', 'inline'); display('pagemenu_bottom', 'block', 'block'); if (o1.innerHTML.indexOf('details')) { o1.innerHTML = "details >>"; } else { o1.innerHTML = ""; } return false; }
function pop(url, w, h) { id = Math.floor(Math.random() * 10000); eval("pop_" + id + " = window.open(url, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=' + w + ',height=' + h);"); }
function dtoh(d) { var s = "0123456789ABCDEF"; var l = d % 16; var h = (d - l)/16; return "" + s.charAt(h) + s.charAt(l); }
function htod(h) { return parseInt(h,16); }
function fade(id, i) { if (!i) { i = 0; } if (typeof id == 'string') e = document.getElementById(id); else e = id; var c = 171 + (i * 7); if (c <= 255) { e.style.background = "#FFFF" + dtoh(c);  setTimeout(function () {fade(id, ++i);}, 200); } }
function settext (id, s) { if (o = document.getElementById(id)) o.innerHTML = s; }
function focus(elementId) { var element = document.getElementById(elementId); element.focus(); }

function dynamicLoadJavascript(src) {
  var script = document.createElement('script');
  script.type = 'text/javascript';
  script.src = src;
  document.getElementsByTagName('head')[0].appendChild(script);  
}

function dynamicLoadCss(src) {
  var link = document.createElement('link');
  link.rel = 'stylesheet';
  link.type = 'text/css';
  link.href = src;
  document.getElementsByTagName('head')[0].appendChild(link);
}

function Map() {
  this.map  = new Object();
  // Map API
  this.add     = function(k,o){ this.map[k] = o; }
  this.remove  = function( k ){ delete this.map[k]; }
  this.get     = function( k ){ return k==null ? null : this.map[k]; }
  this.first   = function(   ){ return this.get( this.nextKey( ) ); }
  this.next    = function( k ){ return this.get( this.nextKey(k) ); }
  this.nextKey = function( k ){ 
    for (i in this.map) {
      if (!k) return i;
      if (k==i) k=null;    /*tricky*/
    }
    return null;
  }
}

var NEXT_CMD_ID = 0;
function Mutex( cmdObject, methodName ) {
  // define static variable and method
  if (!Mutex.Wait) Mutex.Wait = new Map();
  Mutex.SLICE = function( cmdID, startID ) {
    Mutex.Wait.get(cmdID).attempt( Mutex.Wait.get(startID) );
  }
  // define instance method
  this.attempt = function( start ) {
    for (var j=start; j; j=Mutex.Wait.next(j.c.id)) {
      if (j.enter || (j.number && (j.number < this.number ||
                                   (j.number == this.number && j.c.id < this.c.id) ) ) )
      return setTimeout("Mutex.SLICE("+this.c.id+","+j.c.id+")",10);
    }
    this.c[ this.methodID ]();    //run with exclusive access
    this.number = 0;              //release exclusive access
    Mutex.Wait.remove( this.c.id );
  }

  // constructor logic
  this.c        = cmdObject;
  this.methodID = methodName;
  Mutex.Wait.add( this.c.id, this );    //enter and number are "false"
  this.enter    = true;
  this.number   = (new Date()).getTime();
  this.enter    = false;
  this.attempt( Mutex.Wait.first() );
}