Customize TOC icons in Webhelp?

Hi all

I'm using Framemaker 12 and RH 11 as part of TCS5.

I've been trying in vain to change the icons that appear as part of the TOC when I generate to Webhelp.

I'm using a custom .skn file, in which I have a section that looks like this:

<subpane name="Contents">

  <image>page:page.gif?openedbook:bookopen.gif?closedbook:book.gif?</image>

  <color>background:White alink:Silver hover-color:Navy</color>

  <font>font-family:Verdana font-size:8pt font-weight:Normal font-style:Normal text-decoration:none font-sizeadjust:none font-stretch:normal font-variant:normal font-color:Black</font>

  </subpane>

I have the three image files, page.gif, bookopen.gif and book.gif in the same folder as the skn file, but it does not seem that these are getting picked up during generation.

I have changed the colour of the closed book from blue (seemingly the default) to green, but this does not change in the compiled webhelp.

Can anyone suggest anything for me to try, please?