function LevelMultiplier(f)
{
	var activ_index;
	var activ_val;
	 
	activ_index = f.act_level.selectedIndex;
	activ_val = f.act_level.options[activ_index].value;
	
	if (f.gender.options[1].selected)  // vrouw
	{
		switch(activ_val)
		{
			case "2":
				return(-0.1);
			case "3":
				return(1.18);
			case "4":
				return(1.27);
			case "5":
				return(1.36);
			case "6":
				return(1.45);
			case "7":
				return(1.54);
			case "8":
				return(1.63);
			case "9":
				return(1.72);
			case "10":
				return(1.81);
		}
	}
	else  // man
	{
		switch(activ_val)
		{
			case "2":
				return(1.0);
			case "3":
				return(1.2);
			case "4":
				return(1.3);
			case "5":
				return(1.4);
			case "6":
				return(1.5);
			case "7":
				return(1.6);
			case "8":
				return(1.7);
			case "9":
				return(1.8);
			case "10":
				return(1.9);
		}
	}
}

function calc_totalcal()
{
	var form3 = document.totkcal_form;
	var level_factor;

	if (form3.gender[0].checked) // male
	{
		kcals = 655.1 + (9.563 * form3.kg.value) + (1.850 * form3.cm.value) - (4.676 * form3.age.value);
	}
	else
	{
		kcals = 66.5  + (13.75 * form3.kg.value) + (5.003 * form3.cm.value) - (6.775 * form3.age.value);
	}
	level_factor = LevelMultiplier(form3);
	kcals = Math.round(kcals * level_factor);
	form3.kcal.value = kcals;
}