Validation

Hi guys i am trying to do some validation in application form.

I have 3 text box for different mobile numbers like home, work, Mobile like this.. i need 1 field compulsory of 3. User must have to enter at least 1 number of 3. i m using below script for other fields.

Is there other way to do this? :confused:

<script type="text/javascript">

$().ready(function() {

// validate signup form on keyup and submit
$("#signupForm").validate({
rules: {

firstname: "required",
lastname: "required",
pasteresume:"required",
skill:"required",
username: {
required: true,
minlength: 2
},
email: {
required: true,
email: true
},
phone: {
required: true

},
topic: {
required: "#newsletter:checked",
minlength: 2
},
agree: "required"
},
messages: {
firstname: "Please enter your firstname",
lastname: "Please enter your lastname",
pasteresume: "Please enter paste your Resume",
skill: "Please enter your Key Skill",
username: {
required: "Please enter a username",
minlength: "Your username must consist of at least 2 characters"
},
password: {
required: "Please provide a password",
minlength: "Your password must be at least 5 characters long"
},
confirm_password: {
required: "Please provide a password",
minlength: "Your password must be at least 5 characters long",
equalTo: "Please enter the same password as above"
},
email: "Please enter a valid email address",
phone: "Please enter a valid phone number",
agree: "Please accept our policy"
}
});

// propose username by combining first- and lastname
$("#username").focus(function() {
var firstname = $("#firstname").val();
var lastname = $("#lastname").val();
if(firstname && lastname && !this.value) {
this.value = firstname + "." + lastname;
}
});

//code to hide topic selection, disable for demo
var newsletter = $("#newsletter");
// newsletter topics are optional, hide at first
var inital = newsletter.is(":checked");
var topics = $("#newsletter_topics")[inital ? "removeClass" : "addClass"]("gray");
var topicInputs = topics.find("input").attr("disabled", !inital);
// show when newsletter is checked
newsletter.click(function() {
topics[this.checked ? "removeClass" : "addClass"]("gray");
topicInputs.attr("disabled", !this.checked);
});
});

</script>