[Zope] dtml-if question

Hi all, I have a question about The dtml-if. I would like to call an image depending on the url I am at. Lets say Somsone searches for an article on school I have the folowing URL: http://codenamefuture.hurrah.com/nieuws/zoek?SearchableText=&Subject%3Atoken s=school If I wnated to write a dtml-method telling it should load the school image in stead of the standard image how would I call that image? Hope someone can help me on this. James