function calcBMI_english()
{

	var	weight = document.BMI_form_english.weight.value;
	var height = document.BMI_form_english.height.value;
	var BMI = (weight / (height*height)) * 703;

	document.BMI_form_english.bmi.value = Math.round(BMI*10)/10;	
	
}

function calcBMI_metric()
{

	var	weight = document.BMI_form_metric.weight.value;
	var height = document.BMI_form_metric.height.value;
	var BMI = (weight / (height*height));
	
	document.BMI_form_metric.bmi.value = Math.round(BMI*10)/10;		
}