1. ## Calculation

Okay this is my first try at doing some calculations using javascript...and I think you will see that. ha

So here is an image showing what I'm trying to accomplish.

I'm trying to do this calculation (((220 -Age in years -Resting Hear Rate) * .5) + Resting Heart Rate) and then
concatenate it with (((220 -Age in years -Resting Hear Rate) * .65) + Resting Heart Rate)

A couple starting questions that I have are

1) How do I leave the variable blank? var Years; and Var RestingHeartRate;
2) Do I have to run a loop to get the data that is entered into the fields??

FatBurningZone.jpg

Code:
```  <h3>TARGET HEART RATE TRAINING ZONES</h3>
heart rate is meaured in beats per minute.  The heart rate range that you exercise in has been
called “target heart rate training zones”.
</p>

<form action="" id="HeartRateForm" onchange="CalculateFatHeartRates()">

<div class="left" style="margin-top:-10px; margin-bottom:15px; width:775px;font-size:14px; font-weight:bold;">
<br />
<label>Age:
<span style="margin-left:70px; font-size:12px; font-weight:200;"> <input type="text" name="Years" /> years</span>
</label>
<span style="margin-left:70px; font-size:12px; font-weight:200;"><input type="text" name="RestingHeartRate" /> Beats Per Minute (BPM)</span> <span style="margin-left:290px; font-weight:100px;" ><a  href="#"> Need help? </a></span>
</label>

<!--
<p class="calculated accented">Fat Burning "zone" <span><span id="onerepmax">&nbsp;</span> lbs. <!--(estimate)--></span></p>
<!-- <p class="calculated accented">Cardiovascular fitness "zone" <span><span id="strength">&nbsp;</span> %</span></p>-->
</div>

<script type="text/javascript">

var Years;
var RestingHeartRate;
var BaseHeartRate=220;

function CalculateFatHeartRates(Years,RestingHeartRate,BaseHeartRate)

{

var CalculatedHeartRateGoal= (((BaseHeartRate - Years - RestingHeartRate) * .50) + RestingHeartRate) + "to" +
(((BaseHeartRate - Years - RestingHeartRate) * .65) + RestingHeartRate);

document.getElementById("FatBurningHeartRate").innerHTML=CalculatedHeartRateGoal;
}

</script>

</form>

<p style="font-size:18px; font-weight:bold; margin-bottom:-10px;">Your target heart rate training "zones" are:   <span style="font-size:16px; float:right;">Beats per minute (BPM)   </span>  </p>

<p  style="float:right;  margin-bottom:80px; background-image:url(../../includes/images/Fat_Burning_Zone.png); width:780px; height:89px;"><span id="FatBurningHeartRate" style="float:right; margin-right:40px; font-size:16px; margin-top:35px; color:#c88d1c;">  </span> <p>

<p  style="background-color:#c88d1c; width:758px; color:#ffffff; float:right; margin-top:-80px; margin-right:2px; padding-top:10px; padding-bottom:10px; padding-left:10px; padding-right:10px;"> Exercising in your "fat burning zone" will increase the percentage of Calories that you burn from fat.  However, it won't increase the number of TOTAL Calories that you burn.  </p>```

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