title: Run macro to display error message when cell value exceeds 50
body: <p>I've been up all night trying to figure this one out. I have a value derived from a formula in cell I6. This value represents the number of buy orders for a particular stock. I designed the spreadsheet so it only display 50 lines for buys and 50 lines for sells. When the value I6 exceeds 50, I want to display a message saying that "The number of buys )or sells) cannot exceed 50." I would like for this macro to run automatically anytime the value exceeds 50.</p>
  
  <p>I should point out that I've never written a VB macro before, but I'm essentially fearless (as well as clueless).</p>