var popupWin
function openPopUpWindow(filename) {
	popupWin = window.open(filename,'popupWin','top=10,left=10,width=500,height=420');
	popupWin.focus()
}

function closePopUpWindow()		{
	if (popupWin && !popupWin.closed)  {
		popupWin.close();
	}
}