function compute_results(form){

	if (!check_form(form)) {
		return false;
	}
  
	if (form.vlight.value.length == 0){
		form.vlight.value = "0";
	}
	
	if (form.light.value.length == 0){
		form.light.value = "0";    
	}    

	if (form.moderate.value.length == 0){
		form.moderate.value = "0";
	}

	if (form.heavy.value.length == 0){
		form.heavy.value = "0";    
	}    

	if (form.vheavy.value.length == 0){
		form.vheavy.value = "0";
	}

	var us = document.getElementById("mesurement_sys_us");
	if (us.checked) {
		var weight = form.weight.value * 0.45359237;	
		var height = form.height_feet.value * 30.48 + form.height_inches.value * 2.54 ;
	} else {
		var weight = form.weight.value;		
		var height = form.height_cm.value;
	}
	

	var BasalEnergyExpenditureMale = Math.round(66.5 + (13.75 * weight) + (5.003 * height) - (6.775 * form.age.value));	    
	var BasalEnergyExpenditureFemale = Math.round(655 + (weight * 9.563) + (1.85 * height) - (4.676 * form.age.value));
	

	var very_light_male = Math.round((BasalEnergyExpenditureMale * 1.4 / 1440) * form.vlight.value);	
	var light_male = Math.round((BasalEnergyExpenditureMale * 2.5 / 1440) * form.light.value);	
	var moderate_male = Math.round((BasalEnergyExpenditureMale * 4.2 / 1440) * form.moderate.value);
	var heavy_male = Math.round((BasalEnergyExpenditureMale * 8.2 / 1440) * form.heavy.value);	
	var very_heavy_male = Math.round((BasalEnergyExpenditureMale * 12 / 1440) * form.vheavy.value);	
	
	var very_light_female = Math.round((BasalEnergyExpenditureFemale * 1.4 / 1440) * form.vlight.value);	
	var light_female = Math.round((BasalEnergyExpenditureFemale * 2.5 / 1440) * form.light.value);	
	var moderate_female = Math.round((BasalEnergyExpenditureFemale * 2.5 / 1440) * form.moderate.value);
	var heavy_female = Math.round((BasalEnergyExpenditureFemale * 2.5 / 1440) * form.heavy.value);	
	var very_heavy_female = Math.round((BasalEnergyExpenditureFemale * 2.5 / 1440) * form.vheavy.value);

	var wake_male = Math.round(((BasalEnergyExpenditureMale * 1.4) / 1440 * form.vlight.value) + ((BasalEnergyExpenditureMale * 2.5) / 1440 * form.light.value) + ((BasalEnergyExpenditureMale * 4.2) / 1440 * form.moderate.value) + ((BasalEnergyExpenditureMale * 8.2) / 1440 * form.heavy.value) + ((BasalEnergyExpenditureMale * 12) / 1440 * form.vheavy.value));
	var wake_female = Math.round(((BasalEnergyExpenditureFemale * 1.4) / 1440 * form.vlight.value) + ((BasalEnergyExpenditureFemale * 2.5) / 1440 * form.light.value) + ((BasalEnergyExpenditureFemale * 2.5) / 1440 * form.moderate.value) + ((BasalEnergyExpenditureFemale * 2.5) / 1440 * form.heavy.value) + ((BasalEnergyExpenditureFemale * 2.5) / 1440 * form.vheavy.value));

	var sleep_male = Math.round(1440 - form.vlight.value - form.light.value - form.moderate.value - form.heavy.value - form.vheavy.value);
    sleep_male = Math.round((BasalEnergyExpenditureMale / 1440) * sleep_male);
  
    var sleep_female = Math.round(1440 - form.vlight.value - form.light.value - form.moderate.value - form.heavy.value - form.vheavy.value);
    sleep_female = Math.round((BasalEnergyExpenditureFemale / 1440) * sleep_female);
  
 
	var rez_male = document.getElementById("burn_male");
	var rez_female = document.getElementById("burn_female");
	
	rez_male.innerHTML = Math.round((sleep_male * 1) + (wake_male * 1));	
	rez_female.innerHTML = Math.round((sleep_female * 1) + (wake_female * 1));	
	
	
	return;

}

function clear_results(form){    
	form.age.value = "0";
	form.weight.value = "0";
	form.height_feet.value = "0";
	form.height_feet.value = "0";
	form.height_cm.value = "0";
	
	form.sleep.value = "0";	
	form.vlight.value = "0";
	form.light.value = "0";
	form.moderate.value = "0";
	form.heavy.value = "0";
	form.vheavy.value = "0";

	var rez_male = document.getElementById("burn_male");
	var rez_female = document.getElementById("burn_female");

	rez_male.innerHTML = "";	
	rez_female.innerHTML = "";	
	
	var minutes_left = document.getElementById("minutes_left");
	minutes_left.innerHTML = "1440"

	switch_to_us();
	
	return;

}

function switch_to_us() {
	var us = document.getElementById("height_us");
	var metric = document.getElementById("height_metric");

	us.style.display = 'block';
	metric.style.display = 'none';		

	var weight_us = document.getElementById("weight_us");
	var weight_metric = document.getElementById("weight_metric");

	weight_us.style.display = 'inline';
	weight_metric.style.display = 'none';

	var height_centimeters = document.getElementById("height_centimeters");	
	height_centimeters.style.display = 'none';

	var us = document.getElementById("mesurement_sys_us");
	var metric = document.getElementById("mesurement_sys_metric");
	us.checked = true;
	metric.checked = false;
	
	form.weight.value = "0";
	form.height_feet.value = "0";
	form.height_feet.value = "0";
	form.height_cm.value = "0";
		
	return true;
}


function switch_to_metric() {
	var us = document.getElementById("height_us");
	var metric = document.getElementById("height_metric");
	
	us.style.display = 'none';
	metric.style.display = 'block';
	
	var weight_us = document.getElementById("weight_us");
	var weight_metric = document.getElementById("weight_metric");

	weight_us.style.display = 'none';
	weight_metric.style.display = 'inline';		
	
	var height_centimeters = document.getElementById("height_centimeters");	
	height_centimeters.style.display = 'inline';
	
	var us = document.getElementById("mesurement_sys_us");
	var metric = document.getElementById("mesurement_sys_metric");
	us.checked = false;
	metric.checked = true;
	
	form.weight.value = "0";
	form.height_feet.value = "0";
	form.height_feet.value = "0";
	form.height_cm.value = "0";	
	
	return true;
}

function recalc_minutes_left(field) {
	var form = field.form;

	if (check_value(field)) {
		var minutes_left = document.getElementById("minutes_left");
		var sleep = form.sleep.value;	
		var vlight = form.vlight.value;
		var light = form.light.value;
		var moderate = form.moderate.value;
		var heavy = form.heavy.value;
		var vheavy = form.vheavy.value;
		
		var left = 1440 - sleep - vlight - light - moderate - heavy - vheavy;
		minutes_left.innerHTML = left;

		if (left == 0) {
			minutes_left.className = '';
		} else {
			minutes_left.className = 'calorie_calculator_minutes_left_error';		
		}
		
		var ret = true;
	} else {
		var ret = false;	
	}

	return ret;
}


function clear_results_calorie_form(form) {
	clear_results(form);
}


function check_value(field) {
	var ret = true;
	if ((parseInt(field.value)).toString() == field.value.toString()) { // checking for integer
		if (field.value < 0) {
			alert('Uw moet een positieve waarde ingeven (groter dan nul)');
			field.value = "0";
			ret = false;
		}
	} else {
		alert('U moet hele getallen invullen.');
		field.value = "0";		
		ret = false;		
	}

	return ret;
}


function check_form(form) {
	var ret = false;
	
	var us = document.getElementById("mesurement_sys_us");
	if (us.checked) {
		var weight = form.weight.value;	
		var height = form.height_feet.value;
	} else {
		var weight = form.weight.value;		
		var height = form.height_cm.value;
	}
	
	if (form.age.value > 0) {
		if (height > 0) {
			if (weight > 0 ) {
				if (form.sleep.value > 0) {
					var minutes_left = parseInt(document.getElementById("minutes_left").innerHTML);
					
					if (minutes_left > 0) {
						
						alert('De som van het aantal actieve minuten per dag is niet gelijk aan 1440 minuten (24 uur). U moet nog ' + minutes_left + ' minuten verdelen. "Aantal te verdelen minuten" moet nul worden.');
					} else {
						if (minutes_left < 0) {
							alert('De som van het aantal actieve minuten per dag is meer dan 1440 minuten (24 uur). Corrigeer aub de verdeling. "Minuten nog te verdelen" moet nul worden.');
						} else {
							ret = true;
						}
					}
				} else {
					alert('Uw heeft geen waarde ingevuld bij slapen (groter dan nul).');							
				}
			} else {
				alert('Type uw gewicht.');			
			}
		} else {
			alert('Type uw lengte.');
		}
	} else {
		alert('Type uw leeftijd.');	
	}
	
	return ret;
}