[рони]

как то так

<form action="" id='PageViewForm' onsubmit="alert(this.name);" name="PageViewForm">
    <label>
        <input>
    </label>
    <input name="" type="submit" value="ok">
</form>
<script>
    var form = document.forms.PageViewForm;
    var fn = form.onsubmit.bind(form);
    document.forms.PageViewForm.onsubmit = function() {
        fn();
        alert("test");
        return false
    };
</script>