// BAC Formula

function computeIt(form) {var lbs = form.weight.options[form.weight.selectedIndex].value; 
var numLbs = new Number(lbs); 

var drinks = form.drinks.options[form.drinks.selectedIndex].value; 
var numDrinks = new Number(drinks); 

var alco = numDrinks*.045; 
var alcohol = new Number(alco); 

var hours = form.time.options[form.time.selectedIndex].value; 
var numHours = new Number(hours); 

var metabol = numHours*.012; 
var metabolism = new Number(metabol); 

if (form.gender.options[form.gender.selectedIndex].value == "male") 
{gendervalue = ".58"; 
 } else 
 {gendervalue = ".49"; 
} 
var numSex = new Number(gendervalue); 

var weight = numLbs/2.2046; 
var lbs = new Number(weight); 

var water = lbs*numSex; 
var bodywater = new Number(water); 

var millwater = bodywater*1000; 
var milliliters = new Number(millwater); 

var oz = 23.36/milliliters; 
var ounces = new Number(oz); 

var gram = ounces*.806; 
var grams = new Number(gram); 

var gramsmill = grams*100; 
var bac0 = new Number(gramsmill); 

var bac1 = bac0*alcohol; 
var bac2 = new Number(bac1); 

var bac3 = bac2-metabolism; 

if (bac3 < 0) 
{var result = "0.0000"; 
} 
else
{
var bac4 = bac3 + ""; 
var result = bac4.substring(0,6); 
}
form.average.value = result; 
}