img-upload.js - Image Upload jQuery Function

jQuery(document).ready(function() {
    var formfield;

    jQuery('#upload_image_button').click(function() {
        jQuery('html').addClass('Image');
        formfield = jQuery('#upload_image').attr('name');
        tb_show('', 'media-upload.php?type=image&TB_iframe=true');
        return false;
    });
    // user inserts file into post. only run custom if user started process using the above process
    // window.send_to_editor(html) is how wp would normally handle the received data
    window.original_send_to_editor = window.send_to_editor;
    window.send_to_editor = function(html){
    if (formfield) {
        fileurl = jQuery('img',html).attr('src');
        jQuery('#upload_image').val(fileurl);
        tb_remove();
        jQuery('html').removeClass('Image');
    } else {
        window.original_send_to_editor(html);
        }
    };
});