var option0 = new Array(3)
option0[0] = new Option("Laag","5.0",false,false);
option0[1] = new Option("Gemiddled","7.0",false,false);
option0[2] = new Option("Hoog","9.0",false,false);
option0_total = 3;

var option1 = new Array(3);
option1[0] = new Option("Playing Catch", "2.5", false, false);
option1[1] = new Option("Touch/Flag", "8.0", false, false);
option1[2] = new Option("Competitie", "9.0", false, false);
option1_total = 3;

var option2 = new Array(1);
option2[0] = new Option("Gemiddeld", "5.0", false, false);
option2_total = 1;

var option3 = new Array(3);
option3[0] = new Option("Shooting Baskets", "4.5", false, false);
option3[1] = new Option("Oefen-spel", "6.0", false, false);
option3[2] = new Option("Spel/competitie", "8.0", false, false);
option3_total = 3;

var option4 = new Array(2);
option4[0] = new Option("Rapel", "8.0", false, false);
option4[1] = new Option("Klimmen", "11.0", false, false);
option4_total = 2;

var option5 = new Array(2);
option5[0] = new Option("Normaal", "7.95", false, false);
option5_total = 1;
var thisIntensity;

var option6 = new Array(2);
option6[0] = new Option("Normaal", "3.0", false, false);
option6_total = 1;
var thisIntensity;

var option7 = new Array(5);
option7[0] = new Option("Ballroom - langzaam", "3.0", false, false);
option7[1] = new Option("Line Dancing", "4.0", false, false);
option7[2] = new Option("Ballroom - snel", "5.0", false, false);
option7[3] = new Option("Swing", "6.0", false, false);
option7[4] = new Option("Aerobic", "7.0", false, false);
option7_total = 5;

var option8 = new Array(6);
option8[0] = new Option("16 km/u of minder", "4.0", false, false);
option8[1] = new Option("18 km/u", "6.0", false, false);
option8[2] = new Option("21 km/u", "8.0", false, false);
option8[3] = new Option("24 km/u", "10.0", false, false);
option8[4] = new Option("28 km/u", "12.0", false, false);
option8[5] = new Option("32 km/u of meer ", "16.0", false, false);
option8_total = 6;

var option9 = new Array(1);
option9[0] = new Option("Gemiddeld", "10.0", false, false);
option9_total = 1;
        
var option10 = new Array(3);
option10[0] = new Option("Met golfkarretje", "3.5", false, false);
option10[1] = new Option("Eigen clubs trekken", "5.0", false, false);
option10[2] = new Option("Eigen clubs dragen", "5.5", false, false);
option10_total = 3;
        
var option11 = new Array(1);
option11[0] = new Option("Gemiddeld", "8.0", false, false);
option11_total = 1;

var option12 = new Array(3);
option12[0] = new Option("Langzaam", "8.0", false, false);
option12[1] = new Option("Gemiddeld", "10.0", false, false);
option12[2] = new Option("Snel", "12.0", false, false);
option12_total = 3;

var option13 = new Array(3);
option13[0] = new Option("Licht/gematigd", "3.0", false, false);
option13[1] = new Option("Snel", "6.0", false, false);
option13[2] = new Option("Circuit", "8.0", false, false);
option13_total = 3;

var option14 = new Array(11);
option14[0] = new Option("7:30 min / 1000m", "8.0", false, false);
option14[1] = new Option("7:10 min / 1000m", "9.0", false, false);
option14[2] = new Option("6:15 min / 1000m", "10.0", false, false);
option14[3] = new Option("5:37 min / 1000m", "11.0", false, false);
option14[4] = new Option("5:19 min / 1000m", "11.5", false, false);
option14[5] = new Option("5:00 min / 1000m", "12.5", false, false);
option14[6] = new Option("4:41 min / 1000m", "13.5", false, false);
option14[7] = new Option("4:23 min / 1000m", "14.0", false, false);
option14[8] = new Option("4:04 min / 1000m", "15.0", false, false);
option14[9] = new Option("3:45 min / 1000m", "16.0", false, false);
option14[10] = new Option("3:26 min / 1000m", "18.0", false, false);
option14_total = 11;

var option15 = new Array(5);
option15[0] = new Option("Wandelen", "2.5", false, false);
option15[1] = new Option("Paard zadelen", "3.5", false, false);
option15[2] = new Option("Gematigd", "4.0", false, false);
option15[3] = new Option("Draf", "6.5", false, false);
option15[4] = new Option("Galop", "8.0", false, false);
option15_total = 5;
        
var option16 = new Array(2);
option16[0] = new Option("Normaal", "7.0", false, false);
option16[1] = new Option("Competitie", "10.0", false, false);
option16_total = 2;
        
var option17 = new Array(2);
option17[0] = new Option("stationair 100 W", "7.2", false, false);
option17[1] = new Option("stationair 200 W", "12.0", false, false);
option17_total = 2;

var option18 = new Array(4);
option18[0] = new Option("Langzaam", "5.5", false, false);
option18[1] = new Option("Gemiddeld", "7.0", false, false);
option18[2] = new Option("Snel", "9.0", false, false);
option18[3] = new Option("Snel / competitie", "15.0", false, false);
option18_total = 4;

var option19 = new Array(1);
option19[0] = new Option("Gemiddeld", "7.0", false, false);
option19_total = 1;

var option20 = new Array(1);
option20[0] = new Option("Gemiddeld", "5.0", false, false);
option20_total = 1;
        
var option21 = new Array(5);
option21[0] = new Option("Langzaam (4 km/u)", "7.0", false, false);
option21[1] = new Option("Gematigd (6,5 a 8 km/u)", "8.0", false, false);
option21[2] = new Option("Snel (8 a 13 km/u)", "9.0", false, false);
option21[3] = new Option("Race (> 13 km/u)", "14.0", false, false);
option21[4] = new Option("Extreem (bv. bergop)", "16.5", false, false);
option21_total = 5;
        
var option22 = new Array(3);
option22[0] = new Option("Licht", "5.0", false, false);
option22[1] = new Option("Gemiddeld", "6.0", false, false);
option22[2] = new Option("Snel / race", "8.0", false, false);
option22_total = 3;

var option23 = new Array(1);
option23[0] = new Option("Gemiddeld", "8.0", false, false);
option23_total = 1;

var option24 = new Array(1);
option24[0] = new Option("Gemiddeld", "3.0", false, false);
option24_total = 1;

var option25 = new Array(3);
option25[0] = new Option("Dubbel", "6.0", false, false);
option25[1] = new Option("Algemeen", "7.0", false, false);
option25[2] = new Option("Enkel", "8.0", false, false);
option25_total = 3;

var option26 = new Array(1);
option26[0] = new Option("Gematigd", "6.0", false, false);
option26_total = 1;

var option27 = new Array(1);
option27[0] = new Option("Gemiddeld", "3.5", false, false);
option27_total = 1;

var option28 = new Array(2);
option28[0] = new Option("Normaal", "7.0", false, false);
option28[1] = new Option("Competitie", "10.0", false, false);
option28_total = 2;

var option29 = new Array(3);
option29[0] = new Option("Normaal", "3.0", false, false);
option29[1] = new Option("Competitie", "4.0", false, false);
option29[2] = new Option("Strand", "8.0", false, false);
option29_total = 3;

var option30 = new Array(6);
option30[0] = new Option("8 min / km", "5.0", false, false);
option30[1] = new Option("9,5 min / km", "4.5", false, false);
option30[2] = new Option("11 min / km", "4.0", false, false);
option30[3] = new Option("12,5 min / km", "3.5", false, false);
option30[4] = new Option("15 min / km", "3.0", false, false);
option30[5] = new Option("19 min / km", "2.5", false, false);
option30_total = 6;

var option31 = new Array(1);
option31[0] = new Option("Gemiddeld", "10.0", false, false);
option31_total = 1;

var option32 = new Array(1);
option32[0] = new Option("Gemiddeld", "6.0", false, false);
option32_total = 1;

var option33 = new Array(1);
option33[0] = new Option("5 min. per match", "6.0", false, false);
option33_total = 1;

var option34 = new Array(2);
option34[0] = new Option("Normaal", "3.5", false, false);
option34_total = 1;
var thisIntensity;

var option35 = new Array(2);
option35[0] = new Option("50 m/min", "8.9", false, false);
option35[1] = new Option("75 m/min", "12.2", false, false);
option35_total = 2;
var thisIntensity;

var option36 = new Array(2);
option36[0] = new Option("Normaal", "6.47", false, false);
option36_total = 1;
var thisIntensity;

var option37 = new Array(2);
option37[0] = new Option("Normaal", "2.5", false, false);
option37_total = 1;
var thisIntensity;

var option38 = new Array(2);
option38[0] = new Option("Normaal", "10.48", false, false);
option38_total = 1;
var thisIntensity;

var option39 = new Array(2);
option39[0] = new Option("Normaal", "5.48", false, false);
option39_total = 1;
var thisIntensity;

var option40 = new Array(2);
option40[0] = new Option("Normaal", "7.48", false, false);
option40_total = 1;
var thisIntensity;

var option41 = new Array(2);
option41[0] = new Option("Normaal", "9.98", false, false);
option41_total = 1;

var option42 = new Array(2);
option42[0] = new Option("Normaal", "7.98", false, false);
option42_total = 1;

var option43 = new Array(2);
option43[0] = new Option("Normaal", "9.98", false, false);
option43_total = 1;

var option44 = new Array(2);
option44[0] = new Option("Normaal", "3.98", false, false);
option44_total = 1;

var option45 = new Array(2);
option45[0] = new Option("Normaal", "2.98", false, false);
option45_total = 1;

var thisIntensity;

function buildIntensityList()
{
	var formBurn = document.burn_form;
	var selectBox = formBurn.activity;
	user_input = selectBox.options[selectBox.selectedIndex].value;

	formBurn.intensity.length = 0;
	num_opts = eval("option"+user_input+"_total");
 

	for (i=0; i<num_opts; i++)
	{
		eval("formBurn.intensity.options[i] = option"+user_input+"[" + i + "]");
	}
	
	formBurn.intensity.selectedIndex = 0;
	getIntensityValue();
}

function getIntensityValue()
{
	form4 = document.burn_form;
	intensity_index = form4.intensity.selectedIndex;
	thisIntensity = form4.intensity.options[intensity_index].value;  
}

function calc_burn()
{
	form4 = document.burn_form;
	minutes = parseInt(form4.mins.value);
	if (isNaN(thisIntensity))
	{
		getIntensityValue();
	}
  
	// calories/hour
	cal_hr = parseInt(thisIntensity * form4.kg.value);
  
	cal_hr_min = parseInt(cal_hr * minutes);
	calories_burned = cal_hr_min/60;
	form4.burned.value = Math.round(calories_burned);
}