title: Difference between isElementPresent and isVisible in Selenium RC
body: <p>What is the difference between element <code>isElementPresent</code> and <code>isVisible</code> in Selenium RC.
  I get true for</p>
  
  <p><code>selenium.isElementPresent()</code> and <code>selenium.isVisible()</code></p>
  
  <p>If I get false for <code>selenium.isElementPresent()</code> I get Exception on <code>selenium.isVisible()</code></p>