How to post a form using jquery?

Possible Duplicate:
submit a form using jquery

Hello friends

How can I submit a form using jquery. My form contain one file field also how can I post my form with out reloading the whole page. Any body can help me with some sample code?

$.ajax({
    type: 'post',
    url: 'servletToUSe',
    data: {
        "fieldValue": $('#fieldName').val()
    },
    success: function () {
        //response handler
    }