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]) {
	var left = (screen.width - size[1]) / 2;
	var top = (screen.height - size[2]) / 2;
	el.setAttribute('popupprops', 'width=' + size[1] + ', height=' + size[2] + ', left=' + left + ', top=' + top);
	}
	},	
	popup: function(el) {
		window.open(el.href, '', el.getAttribute('popupprops') || '');
	}
};
window.addEvent('domready', function () {
	moopop.captureByRel('popup');
});