// JavaScript Document

function openCentered(url, width, height, windowName, featureString) {

	if(!windowName) windowName = '';

	if(!featureString) { featureString = ''; }

	else { featureString = ',' + featureString; }

	var x = Math.round((screen.availWidth - width) / 2);

	var y = Math.round((screen.availHeight - height) / 2);

	featureString = 'left=' + x + ',top=' + y + ',width=' + width + ',height=' + height + featureString;

	open (url, windowName, featureString);

}