title: How to detect if an element exists in Watir
body: <p>I'm relatively new to Watir but can find no good documentation (examples) regarding how to check if an element exists.  There are the API specs, of course, but these make precious little sense to me if I don't find an example.</p>
  
  <p>I've tried both combinations but nothing seems to work...
  if browser.image (:src "/media/images/icons/reviewertools/editreview.jpg").exists
  then...
  if browser.image (:src "/media/images/icons/reviewertools/editreview.jpg").exists?
  then...</p>
  
  <p>If anyone has a concrete suggestion as per how to implement this, please help!  Thanks!</p>