function compute(form)
{
var co=0
var ho=0
var oo=0
var no=0

massc=(eval(form.ci.value)*12.01)
massh=(eval(form.hi.value)*1.008)
masso=(eval(form.oi.value)*16)
massn=(eval(form.ni.value)*14.01)

masst=massc+massh+masso+massn

form.co.value=massc/masst*100
form.ho.value=massh/masst*100
form.oo.value=masso/masst*100
form.no.value=massn/masst*100
}
function clearForm(form)
{
form.ci.value="0"
form.co.value="0"
form.hi.value="0"
form.ho.value="0"
form.oi.value="0"
form.oo.value="0"
form.ni.value="0"
form.no.value="0"
}