very simple custom form validator

validation.js

	var validate = (function() {
		var c = { log: function() {} };
		// var c = console;
		
		var f = function() {
			$(this).each(function() {
				var t = $(this);
				
				if (validate_presence_of(t)) return;
				if (t.attr('name').match(/email/i))
					if (validate_email(t)) return;
				if (t.attr('data-confirm'))
					if (validate_confirmation_of(t, t.parents('form').find('[name=' + t.attr('data-confirm') + ']'))) return;
			});
		};
		f.has_errors = false;
		
		var validate_presence_of = function(t) {
			c.log('validate_presence_of', t);
			if ($.trim(t.val()) != "") {
				return hide_error(t);
			} else {
				return show_error(t, "cannot be blank");
			}
		};
		
		var email_regex = /^([\w\.%\+\-]+)@([\w\-]+\.)+([\w]{2,})$/i;
		var validate_email = function(t) {
			c.log('validate_email', t);
			if (email_regex.test(t.val())) {
				return hide_error(t);
			} else {
				return show_error(t, "does not look like an email address");
			}
		};
		
		var validate_confirmation_of = function(t, password_field) {
			c.log('validate_confirmation_of', t, password_field);
			if (t.val() == password_field.val()) {
				return hide_error(t);
			} else {
				return show_error(t, 'must match password');
			}
		};
		
		var show_error = function(t, message) {
			c.log('show error', t, message);
			var container = t.parents('li'),
				inline_message = container.find('.inline_message');
				
			f.has_errors = true;
			
			if (inline_message.length == 0) {
				inline_message = $('<span>').addClass('inline_message');
				container.append(inline_message);
			}
			
			container.addClass('error');
			inline_message.text(message).show();
			
			return true;
		};
		
		var hide_error = function(t) {
			c.log('hide error', t);
			var container = t.parents('li'),
				inline_message = container.find('.inline_message');
			container.removeClass('error');
			inline_message.hide();
			
			return false;
		};
		
		return f;
	})();

	var validateable_inputs = 'input[type=text],input[type=password]';
	$('form').submit(function() {
		validate.has_errors = false;
		validate.apply($(validateable_inputs, this));
		
		return !validate.has_errors;
	}).find(validateable_inputs).blur(validate);