function ac(link) {
	leftPos = 0
	topPos = 0
	if (screen) {
		leftPos = (screen.width / 2) - 280
		topPos = (screen.height / 2) - 350
	}
	window.open(link,"nw","width=560,height=700,scrollbars=no,left="+leftPos+",top="+topPos);
}