function setViewport ()
	{
	var		ua = navigator.userAgent;

	if (ua.indexOf("iPhone", 0) >= 0 || ua.indexOf("iPod", 0) >= 0)
		document.write('<meta name="viewport" content="width=720" />');
	else if (ua.indexOf("iPad", 0) >= 0)
		document.write('<meta name="viewport" content="width=905" />');
	}