gistfile1.js

// the upload image button, saves the id and outputs a preview of the image
$('.meta_box_upload_image_button').click(function() {
	formID = $(this).attr('rel');
	formfield = $(this).siblings('.meta_box_upload_image');
	preview = $(this).siblings('.meta_box_preview_image');
	tb_show('Choose Image', 'media-upload.php?post_id='+formID+'&type=image&custom=simple&TB_iframe=1');
	window.orig_send_to_editor = window.send_to_editor;
	window.send_to_editor = function(html) {
		img = $('img',html);
		imgurl = img.attr('src');
		classes = img.attr('class');
		id = classes.replace(/(.*?)wp-image-/, '');
		formfield.val(id);
		preview.attr('src', imgurl);
		tb_remove();
		window.send_to_editor = window.orig_send_to_editor;
	}
	return false;
});