<!-- Begin
function computeCalories()
{
	if (document.calories.w_unit[0].checked) var wu = document.calories.w_unit[0].value;
	if (document.calories.w_unit[1].checked) var wu = document.calories.w_unit[1].value;
    var distance = document.calories.distance.value;
    var weight = document.calories.weight.value * wu;
    var milesOrKm = document.calories.distanceType.selectedIndex;
   

    // check for invalid values 
    if ((weight < 10) || (weight > 800))
    {
        alert("Entered invalid weight!");
        return;
    }
    if ((distance <= 0) || (distance > 800))
    {
        alert("Entered invalid distance!");
        return;
    }
    if (milesOrKm == 0)
    {
        //convert to kilometers
        distance = distance * 1.609;
    }
    // compute calories
    var calories = weight * distance * 1.036;
    // display results
    document.calories.calories.value = Math.round(calories);
}
//  End -->