[Zope] if text: display text else icon with tal

[Nico de Boer]

I have a problem with my Page Template:

I want the visitors to have the opportunity to get one level up. In my
product I have a field that is called 'level_up_txt'. If this field is
filled in I want to use that, but when they leave the field empty they
have to get a levelup icon. How can I arrange this in TAL?

I've tried it like this:

    <a class="gnawlink" href=""
        tal:attributes="href container/absolute_url"
        tal:content="container/level_up_txt">
    <img src="icon" width="16" height="16" border="0" alt="item"
        tal:attributes="src here/upfolder; alt here/meta_type" /></a>
 
Where upfolder is the icon that I want to use.

Can anybody help me?

Greetz Nico