if (top == self)
{
	var pageForSmall   = "http://www.oudejeugdboeken.nl/start1.html";
	var pageForLarger = "http://www.oudejeugdboeken.nl/start2.html";
     var pageForLargest = "http://www.oudejeugdboeken.nl/start4.html";

	var Height = screen.height;

	if (Height > 800)
 		{location.replace(pageForLargest + "?" + self.location.pathname); }
	if (Height <= 800)
		{location.replace(pageForLarger + "?" + self.location.pathname); }
	if (Height <= 600)
		{location.replace(pageForSmall + "?" + self.location.pathname); }
}