windowopen = false;

function open_window(url,width,height,scroll)
{
	if (windowopen) {
		if (hwin.closed) {
			hwin = window.open(url,"popup","alwaysRaised=yes,width=" + width + ",height=" + height +","+ scroll);
		}
		else {
			hwin.location.href = url;
			hwin.resizeTo(width,height);
			hwin.focus();
		}
	}
	else {
		hwin = window.open(url,"popup","alwaysRaised=yes,width=" + width + ",height=" + height +","+ scroll);
		if (hwin) windowopen = true;
	}
}

function close_window()
{
	if (windowopen) {
		if (!hwin.closed)
			hwin.close();
	}
}