jQuery(document).ready(function() {
    jQuery('#upload_image_button').click(function() {
     formfield = jQuery('#upload_image').attr('name');
     tb_show('', 'media-upload.php?type=image&TB_iframe=true');
     return false;
    });

    window.send_to_editor = function(html) {
     imgurl = jQuery('img',html).attr('src');
     jQuery('#upload_image').val(imgurl);
     tb_remove();
    }
});