function popupWindow(loc, w, h) {
	lftVal = (screen.width-w) / 2;
	topVal = (screen.height-h) / 2;

	newwindow = window.open (loc, 'newwindow', 'width='+w+', height='+h+', left='+lftVal+', top='+topVal+', status=0, toolbar=0, location=0, menubar=0, resizable=0, scrollbars=0');

	if (window.focus) {newwindow.focus()}
        return false;
	}