function compute(form){
var vfin=0
var vini=0
var tini=0
var tfin=0

vfin=(eval(form.vini.value)*eval(form.tfin.value)/eval(form.tini.value))
form.vfin.value=vfin
form.edita.value="("+form.vini.value+"x"+form.tfin.value+"/"+form.tini.value+")"
}
function calc(forma){
var va=0
var vb=0
var ta=0
var tb=0

tb=(eval(forma.vb.value)*eval(forma.ta.value)/eval(forma.va.value))
forma.tb.value=tb
forma.editb.value="("+forma.vb.value+"x"+forma.ta.value+"/"+forma.va.value+")"
}
function clearForm(form){
form.vini.value="0";
form.tini.value="0";
form.tfin.value="0";
form.vfin.value="";
form.edita.value="";
}
function clrForm(forma){
forma.va.value="0";
forma.ta.value="0";
forma.vb.value="0";
forma.tb.value="";
forma.editb.value="";
}