server

var links = ['google.com', 'ya.ru', 'vk.com', 'facebook.com'], i = 0, win = 0, left = 20;

function openWindows(linksArr) {

	setTimeout(function() {

		win = open( 'http://' + linksArr[i++], 'test', 'width=300,height=200,left=' + left + '' );

		win.opener = null;

		left += 320;

		if ( i !== linksArr.length )
			openWindows(linksArr);

	}, 5000);
}

openWindows(links);