My form is submitted by a link using JavaScript, but I am also trying to validate the from justing jQuery validate. The validation doesn't work when submitted by the link, but it does if I change the link to a submit button. What am I doing wrong?

My form:

<form id="findmatch" method="post" action="search">

                <div>

                <label class="formlabel">Match Type
                    <input type="text" name="matchtype" id="matchtype" class="forminput" />
                </label>

                <label class="formlabel">Location (postcode)
                    <input type="text" name="location" id="location" class="forminput" />
                </label>

                <label class="formlabel">Radius (miles)
                    <input type="text" name="Radius" id="Radius" class="forminput" />
                </label>

                <label class="formlabel">Keywords
                    <input type="text" onblur="javascript:usePointFromPostcode(document.getElementById('location').value, showCompleteLatLng)" onchange="javascript:usePointFromPostcode(document.getElementById('location').value, showCompleteLatLng)" name="keywords" id="keywords" class="forminput" />
                </label>

                <input id="lat" class="hidden" name="lat" type="text" value="" />
                <input id="lon" class="hidden" name="lon" type="text" value="" />


                    <a href="javascript:document.getElementById('findmatch').submit();" onmouseover="javascript:usePointFromPostcode(document.getElementById('location').value, showCompleteLatLng)" class="submit">Search</a>                        


                </div>
            </form>

And my jQuery is

<script type="text/javascript">
    $(document).ready(function () {
        $("#findmatch").validate({

            rules: {
                location: "required",
                Radius: {
                    required: true,
                    digits: true
            },
            keywords: "required"
        },

        messages: {
            location: "Please enter your postcode",
            Radius: {
                required: "Please enter a radius",
                digits: "Please only enter numbers"
            },
            keywords: "Please enter the keywords you wish to search for"
        }
    });
});
</script>