Tobias is correct, HideWhenPlugin allows complex javascript boolean logic. 
Even the plugin's home page* gives a good example

<div macro="showWhen tiddler.modifier == 'BartSimpson'"><img 
src="bart.gif"/></div>


That's pretty powerful if you ask me. You can put it any arbitrary statement 
in there that returns either true or false and you should be all set. The 
only 'downside' is that this plugin is not wrapped in a standard macro that 
allows in-line usage. However, you might be able to use it in tiddler 
content as long as you wrap it in <html></html> tags. Then, to parse the 
content, you'd have to use Eric's HTML formatting plugin from 
tiddlytools.com. 


*http://mptw.tiddlyspot.com/empty.html#HideWhenPlugin


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