function calc_bmr()
{
	var form2 = document.bmr_form;
	if (form2.gender.options[0].selected) // man
	{
		kcals = 66.5 + (13.75 * form2.kg.value) + (5.003 * form2.cm.value) - (6.775 * form2.age.value);
	}
	else if (form2.gender.options[1].selected) // vrouw
	{
		kcals = 655.1 + (9.563 * form2.kg.value) + (1.850 * form2.cm.value) - (4.676 * form2.age.value);
	}
	kcals = Math.round(kcals);
	form2.kcal.value = kcals;
}