function indicazione() {
    var mail = document.getElementById("mail");
    var mail2 = document.getElementById("mail2");
    var invia = document.getElementById("Submit");
    
    var verifica = document.getElementById("verifica"); 
    
    
    if (new RegExp('^[-!#$%&\'*+\\./0-9=?^A-Z_`a-z{|}~]+@[-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~][-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~][-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+\\.[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~][-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+$').test(mail.value) && verifica.value.length==5 && mail2.value==mail.value){
        invia.disabled = false;             
    }else{      
    invia.disabled = true;          
}
} 

function errata() {
    var verifica = document.getElementById("verifica");
    var verificadiv = document.getElementById("verificadiv");
    var mail = document.getElementById("mail");
    var maildiv= document.getElementById("maildiv");
    var mail2 = document.getElementById("mail2");
    var mail2div= document.getElementById("mail2div");
    var invia = document.getElementById("Submit");
    
    if (new RegExp('^[-!#$%&\'*+\\./0-9=?^A-Z_`a-z{|}~]+@[-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~][-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~][-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+\\.[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~][-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+$').test(mail.value)){
        maildiv.style.backgroundColor=mail.style.backgroundColor;
        maildiv.style.width="158px";        
    }else{
    maildiv.style.backgroundColor="RED";
    maildiv.style.width="158px";       
} 
if (mail2.value==mail.value && mail2.value!=""){
    mail2div.style.backgroundColor=mail2.style.backgroundColor;
    mail2div.style.width="158px";  
}else{
mail2div.style.backgroundColor="RED";
mail2div.style.width="158px";
}    
if (verifica.value.length==5){
    verificadiv.style.backgroundColor=verifica.style.backgroundColor;
    verificadiv.style.width="158px";  
}else{
verificadiv.style.backgroundColor="RED";
verificadiv.style.width="158px";
} 
}

function azzera(){
    var invia = document.getElementById("Submit");
    var verifica = document.getElementById("verifica");
    var verificadiv = document.getElementById("verificadiv");
    var maildiv= document.getElementById("maildiv");
    var mail2div= document.getElementById("mail2div");
    verificadiv.style.backgroundColor=verifica.style.backgroundColor;
    maildiv.style.backgroundColor=verifica.style.backgroundColor;
    mail2div.style.backgroundColor=verifica.style.backgroundColor;
    invia.disabled= false;    
}