jQuery Email Field Validation

[javascript]
(function ($) {
$.fn.validateEmail = function () {
return this.each(function () {
var $this = $(this);
$this.change(function () {
var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
if ($this.val() == "") {
$this.removeClass("badEmail").removeClass("goodEmail")
}else if(reg.test($this.val()) == false) {
$this.removeClass("goodEmail");
$this.addClass("badEmail");
}else{
$this.removeClass("badEmail");
$this.addClass("goodEmail");
}
});
});
};
})(jQuery);
[/javascript]

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