1Remove the required: true rule.
2
3Demo: Fiddle
4
5jQuery('.validatedForm').validate({
6            rules : {
7                password : {
8                    minlength : 5
9                },
10                password_confirm : {
11                    minlength : 5,
12                    equalTo : "#password"
13                }
14            }

1var check = function() {
2  if (document.getElementById('password').value ==
3    document.getElementById('confirm_password').value) {
4    document.getElementById('message').style.color = 'green';
5    document.getElementById('message').innerHTML = 'matching';
6  } else {
7    document.getElementById('message').style.color = 'red';
8    document.getElementById('message').innerHTML = 'not matching';
9  }
10}