function grootte()
{
	var x,y;
	if (self.innerHeight) // all except Explorer
	{
		x = self.innerWidth;
		y = self.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight)
		// Explorer 6 Strict Mode
	{
		x = document.documentElement.clientWidth;
		y = document.documentElement.clientHeight;
	}
	else if (document.body) // other Explorers
	{
		x = document.body.clientWidth;
		y = document.body.clientHeight;
	}
	
	z = document.getElementById('container').offsetHeight;
	
	if(z > y)
		w = z;
	else
		w = y - 40;
		//w -= 20;
		document.getElementById('container').style.height = w + "px";
		w -= 141;
		document.getElementById('midden').style.height = w + "px";
		w += 1;
		document.getElementById('menu').style.height = w + "px";
}