show /hide elements

[merlino68]

I used this js code in on change element :

var type = document.getElementById ('tm_test ___ tipo_test'). getValue;
var element1 = Fabrik.getBlock ('form_7'). formElements.get ('tm_test ___ Plica_soprailliaca');
var = element2 Fabrik.getBlock ('form_7'). formElements.get ('tm_test ___ Plica_pettorale');
if (type != 3)
{
element1.hide ();
element2.hide ();
}
else
{
element1.show ();
element2.show ();
}

The code only works only one time, it does not work any other change
Why? :-(