function returnBMI ()
{
	//inputSelector
	if (!document.getElementById('bmi_height_scale_i') || document.getElementById('bmi_height_scale_i').checked == false) 
	{ 
		var height_scale_m = 'm'; 
		var height_scale_i = 'm';
	}
	else if (!document.getElementById('bmi_height_scale_m') || document.getElementById('bmi_height_scale_m').checked == false) 
	{ 
		var height_scale_m = 'i'; 
		var height_scale_i = 'i';
	}
	else 
	{
		var height_scale_i = $F('bmi_height_scale_i');
		var height_scale_m = $F('bmi_height_scale_m');		
	}
	
	var weight = '';
	var height = '';
	var inches = '';
	var height_scale = '';

	if (height_scale_i == 'i')
	{
		weight = $F('bmi_weight_i');
		height = $F('bmi_height_i');
		inches = $F('bmi_height_inches');
		height_scale = 'i';
	}
	else if (height_scale_m == 'm')
	{
		weight = $F('bmi_weight_m');
		height = $F('bmi_height_m');
		height_scale = 'm';
	}

	var pars = 'weight='+weight+'&height='+height+'&inches='+inches+'&scale='+height_scale;

	$j.ajax({
		type: "post",
		url: "/tools/bmi/bmi.php",
		data: 'weight='+weight+'&height='+height+'&inches='+inches+'&scale='+height_scale,
		dataType: "json",
		success: function(data) {
			$j('#bmi').html(data.bmi);
			$j('#bmi_results').show();
		},
		error: function() {
		}
	});
}

function changeheight(measurementSystem)
{
	var hide_id = '';
	var show_id = '';

	if (measurementSystem == 'i')
	{
		show_id = 'metric_';
		hide_id = 'imperial_';
	}
	else
	{
		show_id = 'imperial_';
		hide_id = 'metric_';
	}

	document.getElementById('bmi_'+hide_id+'height').style.display = 'none';
	document.getElementById('bmi_'+show_id+'height').style.display = 'block';

	document.getElementById('bmi_'+hide_id+'weight').style.display = 'none';
	document.getElementById('bmi_'+show_id+'weight').style.display = 'block';
}