Open a popup window in the center of the screen

open-popup-center.js

/**
 * Opens a popup in the center of the screen
 *
 * @param url
 * @param title
 * @param width
 * @param height
 * @returns {window}
 */
function openPopupCenter(url, title, width, height) {
	var top  = (screen.height/2)-(height/2);
	var left = (screen.width/2)-(width/2);

	return window.open(
		url, title,
		'width='+width+',height='+height+',top='+top+',left='+left+',resizable=yes'
	);
}