var win = null;
function openWindow(url, name, width, height, menu, resizable, scrollbars) {
	if(win == null || win.closed) {
		win = window.open(url, name, 'width=' + width + ',height=' + height + ',menu=' + menu + ',resizable=' + resizable + ',scrollbars=' + scrollbars);
	}
	else {
		win.close(); win = window.open(url, name, 'width=' + width + ',height=' + height + ',menu=' + menu + ',resizable=' + resizable + ',scrollbars=' + scrollbars);
	}
}