function zero() {

if(document.location.href == "http://www.spaziotendelecce.it/?tenda=prevents") {

document.getElementById("piva").disabled = true;
document.getElementById("azien").disabled = true;
document.getElementById("codfisc").disabled = false;
document.getElementById("nome").value = "";
document.getElementById("cognome").value = "";
document.getElementById("ast").style.visibility="visible";
document.getElementById("ast1").style.visibility="visible";
document.getElementById("ast2").style.visibility="visible";
document.getElementById("piva").style.backgroundImage="url('./pages/images/disabled.gif')";
document.getElementById("azien").style.backgroundImage="url('./pages/images/disabled.gif')";
document.getElementById("codfisc").style.background="url('./pages/images/ombra.gif') #f6f6f6 top repeat-x";

}

}

function attiva()
{
document.inviodati.piva.disabled = false;
document.inviodati.azien.disabled = false;
document.inviodati.codfisc.disabled = true;
document.getElementById("nome").value = "Referente";
document.getElementById("cognome").value = "Referente";
document.getElementById("ast").style.visibility="hidden";
document.getElementById("ast1").style.visibility="hidden";
document.getElementById("ast2").style.visibility="hidden";
document.inviodati.piva.style.background="url('./pages/images/ombra.gif') #f6f6f6 top repeat-x";
document.inviodati.azien.style.background="url('./pages/images/ombra.gif') #f6f6f6 top repeat-x";
document.inviodati.codfisc.style.backgroundImage="url('./pages/images/disabled.gif')";
}

function disattiva()
{
document.inviodati.piva.disabled = true;
document.inviodati.azien.disabled = true;
document.inviodati.codfisc.disabled = false;
document.getElementById("nome").value = "";
document.getElementById("cognome").value = "";
document.getElementById("ast").style.visibility="visible";
document.getElementById("ast1").style.visibility="visible";
document.getElementById("ast2").style.visibility="visible";
document.inviodati.piva.style.backgroundImage="url('./pages/images/disabled.gif')";
document.inviodati.azien.style.backgroundImage="url('./pages/images/disabled.gif')";
document.inviodati.codfisc.style.background="url('./pages/images/ombra.gif') #f6f6f6 top repeat-x";
}