function popUpImage(img, width, height) {
	var widthMargin = 34;
	var heightMargin = 60;

	if (width == null) { width = 400 - widthMargin; }
	if (height == null) { height = 500 - heightMargin; }

	var params = "width=400, height=500, location=no, menubar=no, status=no, toolbar=no";
	var myWin = window.open(img, "sitPop", params);
	myWin.document.title = "screenshot";
	myWin.document.bgColor = "#ffffcc";
	myWin.resizeTo(width + widthMargin, height + heightMargin);
	myWin.focus();
}