Windows Safari problem:

If I execute the line below, updatePriority() below runs, actiontemp.php gets called and my tables update appropriately.
 <input type="button" value="P" title="Prioritise" onclick="updatePriority('<?php echo $my->id; ?>','<?php echo $ubooks[$i]->book_id; ?>');" />

    function updatePriority(UserID,BookID)
    {
    $(document).ready(
        function()
        {
        $.post("actiontemp.php", {ui: UserID, bi: BookID, actionType: 'update'});   
        });
    }

If I change the 'button' to type 'submit', actiontemp.php above no longer gets called.
<form action="pagerebuild.php" method="post" name="something">
    <input type="submit" value="P" title="Prioritise" onclick="updatePriority('<?php echo $my->id; ?>','<?php echo $ubooks[$i]->book_id; ?>');" />
</form>

Other browsers seem to work OK. Has anyone else encountered this?