function getmin(time) {
if (time/60<1){
mins = 0;}
 else mins = parseInt(time/60);   
 return mins; 
}


function getsec(time) {
if (time/60<1){
mins = 0;}
 else mins = parseInt(time/60);   
  secs = parseInt(time-60*mins);
 return secs;    
}

 
function compute(form) { 

if ((form.distancetimeh.value == null ||
form.distancetimeh.value.length == 0) || (form.distancetimem.value == null ||
form.distancetimem.value.length == 0) ||(form.distancetimes.value == null ||
form.distancetimes.value.length == 0) ) { return; }

var intime = (form.distancetimeh.value*3600)+(form.distancetimem.value*60)+(form.distancetimes.value*1);
if (intime==0) {return;}

var indist =form.distancerun.value/1.6;

var dist =form.newdistance.value/1.6;

var fac1 = 3600/(13.5-(0.049*indist)+2.44/(Math.pow(indist,0.79)))*indist;
var fac2 = 3600/(13.5-(0.049*dist)+2.44/(Math.pow(dist,0.79)))*dist;
var time = (intime/fac1)*fac2;
temph = parseInt(time/3600);

if(temph >= 1) hrs = temph;
else {
hrs = 0;} 
mins = getmin(time-hrs*3600);
secs = getsec(time-hrs*3600);
form.newtimeh.value = hrs;
form.newtimem.value = mins;
form.newtimes.value = secs;


var oldpace = intime/form.distancerun.value;
var oldpacem = getmin(oldpace);
var oldpaces = getsec(oldpace);
var newpace = time/(dist*1.6);

var newpacem =getmin(newpace);
var newpaces = getsec(newpace);

 if (oldpaces  <10)
 {
  form.oldpacem.value = oldpacem +':0'+oldpaces;
 }
 else
 {
   form.oldpacem.value = oldpacem +':'+oldpaces;

 }

 if (newpaces<10)
 {
  form.newpacem.value = newpacem +':0'+newpaces;
 }
 else
 {
  form.newpacem.value = newpacem +':'+newpaces;

 }

 
}