function ClearForm (form)
	{
        form.weight.value="";
        form.waist.value="";
        form.bodyfat.value="";
	}

function VerifyForm(form) 
	{
        
        // Holds whether or not the form is correct
        var Correct = true;

        // Check for missing fields
        if (form.weight.value == null || form.weight.value.length == 0 ||
        form.waist.value == null || form.waist.value.length == 0) {
                alert ("\nPlease fill in all of the form elements");
                Correct = false;
     }
        
        // Check that only numbers are in the weight and waist fields
        else {
                // Holds the floats representing the weight and waist
                var TestWeight;
                var TestWaist;

                // Parse the weight and waist values and put in the variables
                TestWeight = parseFloat(form.weight.value);
                TestWaist = parseFloat(form.waist.value);

                // Check to see that TestWeight is a number
                if (isNaN (TestWeight)) {
                        alert("\nMake sure to enter the weight\nas a number.");
                        Correct = false;
                        form.weight.value="";
                }

                // Check to see that TestWaist is a number
                if (isNaN (TestWaist)) {
                        alert("\nMake sure to enter the waist size\nas a number.");
                        Correct = false;
                        form.waist.value="";
                }
        
                // Check that the TestWeight is greater than 0
                if (TestWeight <= 0) {
                        alert("\nCome on.  Enter a real weight.");
                        Correct = false;
                        form.weight.value="";   
                }

                // Check that the TestWaist is greater than 0
                if (TestWaist <= 0) {
                        alert("\nCome on.  Enter a real waist size.");
                        Correct = false;
                        form.waist.value="";    
                }

        }

        // If the inputs are correct, calculate the bodyfat percent
        if (Correct) {
                
                // Holds the bodyfat number and percent
                var BF;
                var BFPercent;

                // Make the male calculations   
                if (form.gender[0].checked) {
                        BF = -98.42 + 4.15*TestWaist - .082*TestWeight;
                }

                // Make the female calculations
                else {
                        BF = -76.76 + (4.15*TestWaist) - (.082*TestWeight);
                }
                
                // Calculate the bodyfat percentage
                BFPercent = BF / TestWeight;
                BFPercent = BFPercent * 100;
                BFPercent = Math.round(BFPercent);

                // Send this number to the screen
                form.bodyfat.value = BFPercent + "%";
        }
}

function FigureBMI()
{
 if (document.bmi.inches.value == null || document.bmi.inches.value == 0 ||
     document.bmi.pounds.value == null || document.bmi.pounds.value == 0)
	{
     alert ("\nPlease fill in all of the form elements");
	}
 else
 	{
	 meters = document.bmi.inches.value*0.0254;
	 kilograms = document.bmi.pounds.value*0.4535924;  
	 Square      = meters * meters;
	 document.bmi.calcval.value = Math.round(kilograms/Square);
	 }
}

function MM_openBrWindow(theURL,winName,features) 
{ 
  window.open(theURL,winName,features);
}

function myCon() 
{
  var FromVal, ToVal, FromName, ToName, val1, val2, Factor;

  val1 = document.MainForm.amount.value;
  val2 = val1
  val1 = parseFloat(val1);
  if (isNaN(val1)) val1 = 1;
  document.MainForm.amount.value = val1;
  
  FromVal = document.MainForm.from[document.MainForm.from.selectedIndex].value;
  ToVal = document.MainForm.to[document.MainForm.to.selectedIndex].value;
  FromName = document.MainForm.from.options[document.MainForm.from.selectedIndex].text;
  ToName = document.MainForm.to.options[document.MainForm.to.selectedIndex].text;

  Factor = eval("(" + FromVal + ")/(" + ToVal + ")");
  val1 *= Factor;
  val1 = Math.round(val1 *10000000)/10000000;
  
  document.MainForm.answer.value = val2 + " " + FromName + " = " + val1 + " " + ToName;
}


function calc_hr()
{
 level = document.form1.level.value;
 val = 220-document.form1.age.value;
 
 if (document.form1.level[0].checked)
 {
  val1 = val * .4;
  val2 = val * .5;
 }
 
 if (document.form1.level[1].checked)
 {
  val1 = val * .5;
  val2 = val * .6;
 }
 
 if (document.form1.level[2].checked)
 {
  val1 = val * .6;
  val2 = val * .8;
 }

 if (document.form1.level[3].checked)
 {
  val1 = val * .7;
  val2 = val * .9;
 }
                                                
 document.form1.target1.value = Math.round(val1);
 document.form1.target2.value = Math.round(val2);
}

function computeBMR(form)
{
 form.BMRMale.value = Math.round(66.473 + ((form.weight.value / 2.2 ) * 13.751) + (5.0033 * form.height.value * 2.54) - (6.55 * form.age.value));
 form.BMRFemale.value = Math.round(665.51 + ((form.weight.value / 2.2 ) * 9.463) + (1.8496 * form.height.value * 2.54) - (4.6756 * form.age.value));
}

function clearBMR(form)
{
 form.age.value = "";
 form.weight.value = "";
 form.height.value = "";
 form.BMRMale.value = "";
 form.BMRFemale.value = "";
}

function Owt() 
{
 var pounds=document.form.pounds.value;
 var feet=document.form.feet.value;
 var inches=document.form.inches.value;
 var waist=document.form.waist.value;
 var Correct = true;
 
 if (document.form.pounds.value == null || document.form.pounds.value.length == 0)
 	{
 		alert ("\nPlease enter your weight");
		Correct = false;
	}
 if (document.form.feet.value == null || document.form.feet.value.length == 0 || 
     document.form.inches.value == null || document.form.inches.value.lenght == 0)
	{
	 	alert ("\nPlease enter height - both feet and inches");
		Correct = false;
	}
 if (document.form.waist.value == null || document.form.waist.value.length == 0)
 	{	 
	 	alert ("\nPlease enter waist measurement");
		Correct = false;
	}	 
	 
 if (Correct)
 	{
	 if(document.form.gender[0].checked) 
     	factor=98.42; 
	 else factor=76.76;

	 TotalInches = eval(feet*12) + eval(inches);
	 Meters      = TotalInches/39.36;
	 Square      = Meters * Meters;

	 bfp=((4.15*waist)-factor-0.082*pounds)/pounds;

	 if(document.form.gender[0].checked) 
	 	bmiweight=Square*24*2.2; 
	 else 
	 	bmiweight=Square*25*2.2;

	 if(document.form.activity[1].checked) 
 		bmiweight=bmiweight-2; 
	 else if(document.form.activity[2].checked) 
	 	bmiweight=bmiweight-5;
	 else 
	 	bmiweight=bmiweight;

	 if(document.form.age[0].checked)
 		bmiweight=bmiweight-5; 
	 else if(document.form.age[1].checked) 
	 	bmiweight=bmiweight; 
	 else bmiweight=bmiweight+5;

	 if(document.form.faddiet[0].checked) 
	 	bmiweight=bmiweight+5; 
	 else bmiweight=bmiweight;

	 if(document.form.gender[0].checked)
		{
		 document.form.goalweight.value=Math.round(bmiweight);
		 document.form.overweight.value=Math.round(pounds-bmiweight);
		 document.form.excessfat.value=Math.round(pounds*(bfp-0.08));
		}
	 else
		{
		 document.form.goalweight.value=Math.round(bmiweight);
		 document.form.overweight.value=Math.round(pounds-bmiweight);
		 document.form.excessfat.value=Math.round(pounds*(bfp-0.13));
		}
	}
}

function ClearOwtForm()
{
 	document.form.pounds.value="";
 	document.form.feet.value="";
 	document.form.inches.value="";
 	document.form.waist.value="";
 	document.form.goalweight.value="";
 	document.form.overweight.value="";
 	document.form.excessfat.value="";
}

function CalcCalForm()
{
	if (form.mins.value == null || form.mins.value.length == 0 ||
        form.weight.value == null || form.weight.value.length == 0)
		{
         alert ("\nPlease fill in all of the form elements");
		}
    else
		{        
		 factor = document.form.exercise[document.form.exercise.selectedIndex].value;
		 form.total.value = Math.round(factor * form.weight.value * form.mins.value);
		}
}

function ClearCalForm(form)
{
	form.mins.value="";
	form.weight.value="";
}

function CalcDCI()
{
	if (document.form.inches.value == null || document.form.inches.value.length == 0 ||
        document.form.pounds.value == null || document.form.pounds.value.length == 0 ||
        document.form.years.value == null    || document.form.years.value.length == 0) 
		{
                alert ("\nPlease fill in all of the form elements");
				return;
		}
				
	var inches=document.form.inches.value;
	var pounds=document.form.pounds.value;
    var years=document.form.years.value;
	var factor=document.form.exercise[document.form.exercise.selectedIndex].value;
	
	// Make the male calculations   
    if (document.form.gender[0].checked)
	  {
     	weight = 66 + (13.7 * (pounds / 2.2));
  		height = 5 * (inches * 2.54);
  		age = 6.8 * years;
  		document.form.result.value = (Math.round(weight + height - age) * factor);                   
      }

    // Make the female calculations
    else
	  {
       weight = 655 + (9.6 * (pounds / 2.2));
	   height = 1.7 * (inches * 2.54);
	   age = 4.7 * years;
       document.form.result.value = (Math.round(weight + height - age) * factor);                  
	  }
				
}

function ClearDCI()
{
	document.form.inches.value="";
	document.form.pounds.value="";
    document.form.years.value="";
	document.form.result.value="";
}