<script type="text/javascript">
    $(formElement).submit(function() {
        ... how to do the jquery stuff..
        return true;
    });

    <?php
    $my_variable_with_value1 = 'abc';
    $my_variable_with_value2 = 'def';
    $another_one_variable = 'mango';
     ?>
    <form method="post" action="process.php">
    <input type="text" id="id1" name="name1" value="<?php echo $my_variable_with_value1 ?>"  />
    <input type="text" id="id2" name="name2" value="<?php echo $my_variable_with_value2 ?>"  />
    <input type="submit" value="Submit" />
    </form>

$(formElement).submit(function() {

<input type="submit" value="Submit" onclick="submitform()" />

function submitform()
{
    $('#id1').val('');
    $('form').submit();
}

<script type="text/javascript">
    $(formElement).submit(function() {
        $("#Var1").val("");
        $("#Var2").val("");
        return true;
    });