function opendoc (href) {
	
	var w = 850, h = 500;
	
	var left = (screen.width - w)/2;
	var top =  (screen.height - h)/2;

	window.open(
		href, '','width=' + w + ',height=' + h + ',left='+left+',top='+top+',' +
		'scrollbars=yes,toolbar=no,location=no,status=no'
	);

	return false;

}