function help (winURL, winWidth, winHeight, winLeft, winTop) {
	if (!winWidth) winWidth = 320;
	if (!winHeight) winHeight = 216;

	if (!winLeft || !winTop) {
		winLeft = (screen.width - winWidth) / 2;
		winTop = (screen.height - winHeight) / 2;
	}

	win = window.open(winURL, '_blank', 'height='+winHeight+',width='+winWidth+',top='+winTop+',left='+winLeft+',scrollbars=yes,resizable,status=yes');

	if (win == null)
		alert("Unable to open a new browser window,\n This might be due to a 'popup blocker'");
	else
		if (parseInt(navigator.appVersion) >= 4) win.window.focus();
		
	return (win != null);
}