var windowOpen = function(href, width, height) {
	var width = width || 850;
	var height = height || 650;
	window.open(
		href,
		null,
		'left=' + (screen.availWidth / 2 - width / 2) + ', ' +
		'top=' + (screen.availHeight / 2 - width / 2) + ', ' +
		'width='+ width +', ' +
		'height='+ height +', ' +
		'resizable=yes, ' +
		'toolbar=no, ' +
		'scrollbars=yes, ' +
		'status=no'
	);
	return false;
};