I did find something while I was trying to install this. I think the part of find:
<a href="javascript: x()" onclick="DoPrompt('image');" title="{$lang.IMAGE_ALT}" alt="{$lang.IMAGE_ALT}"><img id="image" onmouseover="raiseButton(this.id);" onmouseout="normalButton(this.id);" onmousedown="lowerButton(this.id);" class="markup_panel_normal_button" src="{$config.BASE_URL}/images/{$style_array.markup_panel}/image.gif" /></a>
should read
<a href="javascript: void(0)" onclick="DoPrompt('image');" title="{$lang.IMAGE_ALT}" alt="{$lang.IMAGE_ALT}"><img id="image" onmouseover="raiseButton(this.id);" onmouseout="normalButton(this.id);" onmousedown="lowerButton(this.id);" class="markup_panel_normal_button" src="{$config.BASE_URL}/images/{$style_array.markup_panel}/image.gif" /></a>
The "javascript: x() is javascript void(0)
I'm not sure on this, but it's what I found in my file.
Something of importance; when you click the markup button it brings up the add spoiler box and lets you add the text, but when you click the ok button it doesn't add the text to the post.
Any ideas on that one, Gizmo?