function reveal(a){
var e=document.getElementById(a);
if(!e)return true;
if(e.style.display=="none"){
e.style.display="block"
} else {
e.style.display="none"
}
return true;
}

function calcEnglish(form, feet, inches, pounds) {
   if ((! inches) || isNaN(inches))
     inches = 0;
   TotalInches = eval(feet*12) + eval(inches);
   var bmi = Math.round(pounds * 703 * 10 / TotalInches / TotalInches) / 10;
   if (isNaN(bmi)) bmi = "";
   form.calcval.value = bmi;
}

function calcMetric(form, meters, kilograms) {   
   var bmi;
   bmi = Math.round(kilograms * 10 / meters / meters) / 10;
   if (isNaN(bmi)) bmi = "";
   form.calcval.value = bmi;
}