ModalWindow = Class.create({
  initialize: function(){
    this.cont = "";
    this.overlay = "";
    this.win = "";
    this.container = new Element('div', {id:'modal-container'});
    var container = this.container;
    $(document.body).insert({bottom:container});
  },
  show: function(element, overlay){
    this.close();
    this.cont = element;
    if(overlay) this.overlay = this.container.appendChild(new Element('div', {'class':'modal-overlay'}));
    this.win = this.container.appendChild(new Element('div', {'class':'modal-window'}));
    this.win.insert({bottom:this.cont});
    var closeBtn = new Element('span',{id:'modal-close-btn'}).update("<a href='javascript:void(0);'>[ close ]</a>");
    this.win.insert({top:closeBtn});
    $("modal-close-btn").observe('click', this.close.bind(this));
  },
  close: function(e){
    if(e) e.stop();
    this.container.childElements().invoke('remove');
  }
});