Simple email validation

Simple email validation.js

$('input#submit').click(function(){
	var email = $('input#email').val();
	var flag = true;
	$('input.req').each(function(){
		// if the input.req is empty...
		if ($(this).val() == "") {
			$(this).nextAll('span:first').fadeIn();
			flag = false;
		} else {
			// if the input#email field has no @ sign...
			if(email.indexOf('@') == -1) {
				$('form span').fadeIn();
				flag = false;
			} 
		}
	});
	return flag;
});