Hi helpful people, I'm a complete newbie, as my question will no doubt prove: I am trying to interpolate a ZPT path into frame statement using tal:attributes: <frameset cols="165,*" tal:define="target here/welcome_html"> <frame name="main" src="banner_html" tal:attributes="src target" /> The objective being to change the target page dynamically. What I get is a Site Error: resource not found, with the html of the target page presented as a long string. I can't find a way of avoiding this. Can someone please help me? Regards Richard Jennings