title: If function - equal/different/blank
body: <p>I'm trying to write an formula that will give me the following result:
  IF H1=H2, write "OK", if they are different, write "NO", if H1 is blank, then become blank too.
  I tried like this:</p>
  
  <pre><code>=IF(H1=H2;"OK";"NO";IF(H1="";""))
  </code></pre>
  
  <p>And it says I've entered too many arguments for this function.</p>
  
  <p>Any advice?</p>