var OpenedOnce = false

function OpenWindow(page_url, lgImgW, lgImgH) {

	if (OpenedOnce) {
		window1.close()
	}

	window1 = window.open(page_url,"window1","scrollbars=yes,resizable=yes,width="+lgImgW+",height="+lgImgH)
	OpenedOnce = true
}