Only text of XSLT transformed data appearing no stlying!

I have a page which downloads a xsl and xml file with ajax. I then use 
xslt to transform them using the following code -

var xslt = new XSLTProcessor();
xslt.importStylesheet(xsl);
var fragment = xslt.transformToFragment(xml, document);
document.getElementById("content").innerHTML = "";
document.getElementById("content").appendChild(fragment);

But only the text appears in the resulting browser display. Is there 
something that is obviously wrong?

If I do the xslt transform by command line (using xalan) it works fine 
(the divs appear as they should).

Can anyone help. I have put the source code online (just unzip and it 
should work, if you open the rubbermallet.html in a browser) -

http://www.rubbermallet.net/example.zip

Any help would be appreciated. I am new to this stuff so you will have 
to excuse the poor code in the javascript.