Height Calculator
function calc_headroom(form) {
var mattress = form.mattress.value;
var ceiling = form.ceiling.value;
var above = form.above.value;
var leg691 = 0
var leg692 = 0
var leg831 = 0
var leg832 = 0
var trim691 = 0
var trim692 = 0
var trim831 = 0