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){
                    $(element).removeClass("mandatory").addClass("success");
                }
            });