Image upload error (FCK Editor, IE6) with fix

System:
Wordpress 2.7.0 with Dean’s FCKEditor For WordPress
Using the html/browser uploader with IE6

Bug:

1. Open post-new.php, add some line in the FCK Editing Area, hit the Add image button.
2. When loading the thickbox IE6 will report a unspecified error at line 28, character/sign 2
3. Net effect: media-upload.php will not load in the thickbox, but full screen in the _top
4. Later on, when you try to insert an image in the post, IE6 throws another error at you: object does not support this method (or something like that) and the screen remains blank

Analysis: when media-upload.php does not have a parent, opener or top win.send_to_editor() is not defined in wp-admin/includes/media.php
Temporary fix to resolve the symptom:

var win = window.dialogArguments || opener || parent || top;
if (win.send_to_editor) win.send_to_editor('<?php echo addslashes($html); ?>');
else history.go(-3);

Earlier in media.php you can also try to resolve the symptom:

<script type="text/javascript">
/* top.location.href should be the page with the editor */
/* self.location.href should be wp-admin/media-upload.php */
/* <![CDATA[ */
if (top == self) history.go(-1);
/* ]]> */
</script>

<div id="html-upload-ui"> ...

The real fix: remove this.blur() on line 27 of thickbox.js:

tb_show(t,a,g);
	// this.blur(); /* do not this.blur() in IE6: unspecified error with FCK editor */