Javascript Form Validation

form_validation.js

function init() {
$('#general').on('submit', function(e) {
pass = true;

$('input, textarea', this).removeClass('error');
$('input, textarea', this).each(function() {
if ($(this).val() === '') {
$(this).addClass('error');
pass = false;
}
})

if (pass === true) {
$.ajax({
url : 'https://www.salesforce.com/servlet/servlet.WebToLead?encoding=UTF-8',
type : 'post',
dataType : 'json',
data : $('#general').serialize(),
success : function(data) {
$('#general').html('<h4>Your message has been received.</h4> <p>Please expect a response within 24-48 hours.</p>')
}
});
}

return false;
});
}