SO fiddle

Test Fiddle mainly for SO Questions

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.js"></script>
<form id="frm" action="" method="get">
    <fieldset>
        <legend>Validation POC</legend>
        <p>
            <label for="cname">Name</label>
            <em>*</em><input name="cname" class="cname" size="25" />
        </p>
        <p>
            <label for="cemail">E-Mail</label>
            <em>*</em><input id="cemail" name="cemail" size="25" />
        </p>
        <p>
            <label for="curl">URL</label>
            <em>  </em><input id="curl" name="curl" size="25"  value="" />
        </p>
        <p>
            <label for="ccomment">Your comment</label>
            <em>*</em><textarea id="ccomment" name="comment" cols="22"></textarea>
        </p>
        <p>
            <input class="submit" type="submit" value="Submit"/>
        </p>
    </fieldset>
</form>

CSS

.mandatory {background-color:#edc0c3; border:1px solid #ff0012;}
.success{border:1px solid Green;}

JavaScript

$.validator.addMethod("urlCheck", function(value, element) {
    return this.optional(element) || /^[a-zA-Z0-9\-\.]+\.(com|org|net|mil|edu|COM|ORG|NET|MIL|EDU)$/.test(value);
}, "check your url");

$("#frm").validate({
    //errorClass: "mandatory",
    // validClass: "success",
    rules: {
        cname: {
            required: true,
            minlength: 5
        },
        cemail: {
            required: true,
            email: true
        },
        curl: {
            urlCheck: true,
            required: true
        }
    },
    messages: {
        cname: "",
        cemail: ""
    },
    highlight: function(element, errorClass, validClass) {
        $(element).removeClass("success").addClass("mandatory");
    },
    unhighlight: function(element, errorClass, validClass) {
        if($(element).hasClass('mandatory')) {
            $(element).removeClass('mandatory').addClass('success');
        }
    }
});