[Zope] ZPT rendered output formatting

Hi Can I have any control over how ZPT formats the html it produces? Specifically, source like this: <p><img tal:attributes="src here/pic/absolute_url" title="a piccie" width="24" height="45" border="2" vspace="2" /></p> ends up like this (one line): <p><img title="a piccie" width="24" height="45" border="2" vspace="2" src="http://localhost:8080/temp_folder/pic"></p> and sometimes, source like this: <img tal:attributes="src here/pic/absolute_url" width="10" height="12" /> renders like this: <img src="http://site.com/pic" width="10" height="12" > Any pointers, please? Thanks Felix.