function fb_share(obj, width, height) {
	if (obj==null) return;
	var url = obj.getAttribute('share_url');
	if (url==null) return;
	
	if (width==null) width = 626;
	else {
		width = parseInt(width);
		if (width<400) width = 626;
	}
	
	if (height==null) height = 436;
	else {
		height = parseInt(height);
		if (height<300) height = 436;
	}
	
	window.open('http://www.facebook.com/sharer.php?u='+encodeURIComponent(url),' sharer', 'toolbar=0, status=0, width='+width+', height='+height);
}