title: Evaluate a css expression only in IE<7 w/out using conditional comments?
body: <p>I already know: "Don't use css expressions!"  My question is not about whether I should be using an expression or if there is an alternative; my question is simply: <strong>Can I get a css expression to only be evaluated in versions of IE prior to version 7 without using conditional comments?</strong></p>
  
  <p>I occasionally use an underscore hack to hide a rule from IE7 but IE7 seems to evaluate expressions anyway.  For example, <code>_width:700px;</code> is ignored by IE7 but <code>_width:expression('700px');</code> is still evaluated.</p>
  
  <p>I know that someone will try to tell me to just use a conditional comment to include the rule, but I am looking for a way to do this without placing a single style rule into a separate file.</p>
  
  <p>A note for those of you who still don't want to let it go: I've chosen to use a css expression, but I didn't do so lightly.  I understand the implications and I am using an expression that only evaluates once.  Stop worrying about my bad decisions and just answer the question already...  ;-)</p>