function arenaCalc(r) 
{
	var ret = 0
	
	if (r <= 1500) 
	{
		ret = 0.22 * r + 14
	}
	else 
	{
		ret = 1511.26/(1+1639.28 *Math.pow(2.71828, -0.00412*r))
	}

	return ret;
}

function ratings()
{
	var rating = arenaCalc(parseInt(document.arena.rank.value))
	document.arena.rating5.value = parseInt(rating)
	document.arena.rating3.value = parseInt(0.88 * rating)
	document.arena.rating2.value = parseInt(0.76 * rating)
}