function creatCalc(form) {
var weight = Number(form.w.value);
var age = Number(form.age.value);
var cr = Number(form.Cr.value);
if (!checkNum(weight,"WEIGHT")) {
form.w.select();
form.w.focus();
return false	}
if (!checkNum(age,"AGE")) {
form.age.select();
form.age.focus();
return false	}
if (!checkNum(cr,"CREATININE")) {
form.Cr.select();
form.Cr.focus();
return false		}
if (form.wu.selectedIndex == 0) {
//  What units for weight?
//  0 = lbs
//  1 = kg
weight = weight * 0.45359237;	}
clear = ((140 - age) * weight) / (72 * cr);
if (form.sex[1].checked) {	//  Is the patient female?
//  0 = male
//  1 = female
clear = clear * 0.8;	}
clear = rounding(clear,0);
form.clear.value = clear;
return true	}
function checkNum(val,text) {
if ((val == null) || (isNaN(val)) || (val == "") || (val < 0)) {
alert("Please enter a value for " + text + ".");
return false	}
return true;	}
function rounding(number,decimal) {
multiplier = Math.pow(10,decimal);
number = Math.round(number * multiplier) / multiplier;
return number	}