function calculate() {
document.forms.Beregn_tilbud.shortcircut.value=1;
var e = document.getElementById ("shadow");
refreshFields(null);
var r = new Number (document.forms.Beregn_tilbud.Beregning.value);
if (r==0) {
e.style.display = "none";
} else {
e.style.display = "block";
}
document.forms.Beregn_tilbud.shortcircut.value=0;
}

function formReset() {
document.forms.Beregn_tilbud.reset();
calculate();
}