function openPreviewWindow() {
	w = window.open(this.getAttribute('href'), 'preview');
	w.focus();
	return false;
}

function prepare_new_window_links() {
	new_window_links = getElementsByTagAndClassName('a', 'new-window-link');
    for (i=0;i<new_window_links.length;i++) {
	    new_window_links[i].onclick = openPreviewWindow;
    }
}

addLoadEvent(prepare_new_window_links);