var validemail = false ;
    var validpassword = false ;
    var validusername = false ;
    var validage = false ;

    function verifyemail()
{
    var email = document.getElementById("signupemail").value ;
    var error = document.getElementById("signupemailerrors") ;
    var emailregex = /^(([^<>()[]\.,;:s@"]+(.[^<>()[]\.,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$/ ;

    if(email.length < 254){
    if( email.length > 0 ){
        if(email.match(emailregex)){
            error.innerHTML = "";
            validemail = true ;
        }
        else
        {
            error.innerHTML = "Invalid email address.";
            validemail = false ;
        }

    }else

    {
        error.innerHTML = "Please fill in." ;
        validemail = false ;
    }
} else
{
    error.innerHTML = "Maximum length exceeded.";
    validemail= false ;
}
}

function verifypassword(){
    var password = document.getElementById("signuppassword").value;
    var passworderror= document.getElementById("signuppassworderrors") ;
    if (password.length < 254){
    if(password.length > 7){
    passworderror.innerHTML = "";
    validpassword = true ;

    }
        else if(password.length == 0)
    {
        passworderror.innerHTML = "Please fill in.";
        validpassword = false ;
    }
    else
    {
        passworderror.innerHTML = "At least 8 characters required.";
        validpassword = false ;
    }
}
    else
    {
        passworderror.innerHTML = "Maximum length exceeded.";
        validpassword = false ;
    }
}

function verifyusername(){
    var username = document.getElementById("signupusername").value ;
    var usernamerror = document.getElementById("signupusernameerrors") ;

    if (username.length == 0)
    {
        usernamerror.innerHTML = "Please fill in.";
        validusername = false;
    }
    else if (username.length > 50)
    {
        usernamerror.innerHTML = "Maximum length exceeded.";
        validusername = false;
    }
    else
    {
        usernamerror.innerHTML = "";
        validusername = true;
    }
}

function verifyage(){
    var age = document.getElementById("signupage").value ;
    var ageerror = document.getElementById("signupageerrors") ;
    var ageregex = /^d+$/;

    if(age.length == 0){
        ageerror.innerHTML = "Please fill this field";
        validage = false;
    }
    else
    {
    if (age.match(ageregex)){
        if (age == 0){
        ageerror.innerHTML = "Please provide your real age." ;
        validage = false;
        }
        else if(age > 130){
        ageerror.innerHTML = "Please provide your real age." ;
        validage = false;
        }
        else
        {
        ageerror.innerHTML = "" ;
        validage = true;
        }

    }else
    {
        ageerror.innerHTML = "Only numbers allowed."
        validage = false;
    }
}
}


function verifysubmit(){
    verifyage();
    verifyemail();
    verifypassword();
    verifyusername();
    if (validage == true && validemail == true && validpassword == true && validusername == true)
    {
     document.getElementById("signupformsubmit").disabled = false ;
    }
else{
    document.getElementById("signupformsubmit").disabled = true ;
}
}