var moopop = {
  width: 0,
  height: 0,

  captureByRel: function(attrVal, parent) {
    this.capture($ES('a', parent || document).filterByAttribute('rel', '*=', attrVal));
  },
  
  capture: function(el, width, height) {
    if ($defined(width) && $defined(height)) {
      this.width = width;
      this.height = height;
    }
    
    switch ($type(el)) {
      case 'element':
        this.add_pop_to(el);
        break;
      case 'string':
      case 'array':
        $$(el).each( function(el) {
          this.add_pop_to(el);
        }, this);
        break;
    }
    
    this.width = null;
    this.height = null;
  },

  add_pop_to: function(el) {
    el.addEvent('click', function(e){ new Event(e).stop(); this.popup(el); }.bind(this));
    
    var size = el.getAttribute('rel').match(/(\d+),\s*(\d+)/) || ['', this.width, this.height];
    
    if (size[1]) el.setAttribute('popupprops', 'width=' + size[1] + ', height=' + size[2] + ',resizable=1,location=0,menubar=0,scrollbars=1,status=0,toolbar=0' );
  },
 
  popup: function(el) {
    window.open(el.href, '', el.getAttribute('popupprops') || '');
  }
};