title: What is additionalparams for?
body: <p>I have inherited some JScript written for CRM 4.</p>
  
  <p>I am trying to remove the IE-specific and deprecated bits.</p>
  
  <p>I have encountered this:</p>
  
  <pre><code>document.FilterLookup = function (source, target) {
      if (IsNull(source) || IsNull(target)) { return; }
  
      var name = IsNull(source.getValue()) ? '' : source.getValue()[0].name;
  
      target.additionalparams = 'search=' + name;
  }
  </code></pre>
  
  <p>Custom Code Validation Tool complains about ".additionalparams".</p>
  
  <p>I've googled a lot but can't even work out what .additionalparams is doing let alone what I could replace it with.</p>
  
  <p>I hope that you do.</p>