title: get Element multiple ID or CLASS
body: <p>I can't make javascript to get more than one element with the class I specify.. I'm using classes on purpose!! If I have 5 divs with the same class, how should I call them?</p>
  
  <pre><code>onmouseover="document.getElementById('logo').style.display='inline';" 
  onmouseout="document.getElementById('logo').style.display='none';"
  
  onmouseover="document.getElementsByClassName('new')[0].style.MozOpacity=0.4;" 
  onmouseout="document.getElementsByClassName('new')[0].style.MozOpacity=1;"
  </code></pre>
  
  <p>And can I make something like : <code>.getElementsByClassName('new,new2,new3')</code></p>