function open_window(subject) {
iMyWidth = (window.screen.width/2) - (350 + 10);
iMyHeight = (window.screen.height/2) - (250 + 25);
Fokus = window.open("", "txt", "height=450,width=300,resizable=no,left=" + iMyWidth + ",top=" + iMyHeight + ",screenX=" + iMyWidth + ",screenY=" + iMyHeight + ",scrollbars=no");
Fokus.focus();
}