function popwin(sPage) {
	if(window.popupWin) {
		if(popupWin.closed != true) {
			window.popupWin.focus();
			window.popupWin.location = sPage;
		} else {
			popupWin = window.open(sPage, "Preview", 'width=320,height=320 left=100 top=100');
		}
	} else {
		popupWin = window.open(sPage, "Preview", 'width=320,height=320 left=100 top=100');
	}
}