function control_pass(){
	var a = '<div class="a">Demasiado Corta</div>';
	var b = '<div class="b">Insegura</div>'
	var c = '<div class="c">Segura</div>'
	var d = '<div class="d">Muy Segura</div>'
	
	var password = document.getElementById('password').value;
	var password2 = document.getElementById('password2').value;
	var username = document.getElementById('username').value;
	var email = document.getElementById('email').value;
	var buton = document.getElementById('botoncito');
	var info = document.getElementById('info');
	var check = document.getElementById('checkbox');
	var meter = passwordStrength(password,username);
	switch(meter){
		case 0: meter = a; break;
		case 1: meter = b; break;
		case 2: meter = c; break;
		case 3: meter = d; break;
	}
	mensaje = (password == password2) ? '<div class="a">Correcto</div>' : '<div class="b">Incorrecto</div>';
	document.getElementById('strmeter').innerHTML = meter;	
	document.getElementById('confirmpassword').innerHTML = mensaje;	
	
	var control = 1;
	if(password != password2) control = 0;
	if(username.length < 4){ control = 0; info.style.visibility= 'visible';} else{ info.style.visibility ='hidden'}
	if(mail(email)) control = 0;
	if(!check.checked) control =0;
	if(control) buton.style.visibility = 'visible';
	else buton.style.visibility = 'hidden';	
}

function mail(valor) {
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(valor)){
	return (false)
	} else {	
	return (true);
	}
}

function passwordStrength(password,username)
{
	var shortPass  = 0;
	var badPass    = 1;
	var goodPass   = 2;
	var strongPass = 3;


    score = 0 
    
    //password < 4
    if (password.length < 4 ) { return shortPass }
    
    //password == username
    if (password.toLowerCase()==username.toLowerCase()) return badPass
    
    //password length
    score += password.length * 6
    
    //penalize repetition, especially aaaaaaaaaaa style
    score -= ( password.length - checkRepetition(1,password).length ) * 3
    score -= ( password.length - checkRepetition(2,password).length ) * 1
    score -= ( password.length - checkRepetition(3,password).length ) * 1
    score -= ( password.length - checkRepetition(4,password).length ) * 1

    //password has 2 numbers
    if (password.match(/(.*[0-9].*[0-9])/))  score += 5 

    //password has 3 numbers
    if (password.match(/(.*[0-9].*[0-9].*[0-9])/))  score += 5 
    
    //password has 2 sybols
    if (password.match(/(.*[!,@,#,$,%,^,&,*,?,_,~].*[!,@,#,$,%,^,&,*,?,_,~])/)) score += 5 
    
    //password has Upper and Lower chars
    if (password.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/))  score += 10 
    
    //password has number and chars
    if (password.match(/([a-zA-Z])/) && password.match(/([0-9])/))  score += 15 
    //
    //password has number and symbol
    if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) && password.match(/([0-9])/))  score += 15 
    
    //password has char and symbol
    if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) && password.match(/([a-zA-Z])/))  score += 15 
    
    //password is just chars
    if (password.match(/^\w+$/))  score -= 10 
    
    //password is just numbers, a worse case
    if (password.match(/^\d+$/))  score -= 30
    
    
    //verifing 0 < score < 100
    if ( score < 0 )  score = 0 
    if ( score > 100 )  score = 100 
    
    if (score < 34 )  return badPass 
    if (score < 68 )  return goodPass
    return strongPass
}


// checkRepetition(1,'aaaaaaabcbc')   = 'abcbc'
// checkRepetition(2,'aaaaaaabcbc')   = 'aabc'
// checkRepetition(2,'aaaaaaabcdbcd') = 'aabcd'

function checkRepetition(pLen,str) {
    res = ""
    for ( i=0; i<str.length ; i++ ) {
        repeated=true
        for (j=0;j < pLen && (j+i+pLen) < str.length;j++)
            repeated=repeated && (str.charAt(j+i)==str.charAt(j+i+pLen))
        if (j<pLen) repeated=false
        if (repeated) {
            i+=pLen-1
            repeated=false
        }
        else {
            res+=str.charAt(i)
        }
    }
    return res
}