title: How to find and click on HTML image element
body: <p>I'm new with Selenium and struggle with this one for few hours. 
  I have an HTML page that contains icon and stream view (both images), the browser view is on 100% and I would like to modify it and make it smaller,
  it can be done by changing browser zoom, modifying CSS property or clicking on the image.</p>
  
  <p>My code starts with open browser and waits till all elements load:</p>
  
  <pre><code>driver = webdriver.Firefox()
  driver.get('http://' + user +':'+password+'@'+camera_address)
  driver.maximize_window()
  driver.implicitly_wait(15) # seconds
  </code></pre>
  
  <p>I tried to do so via zoom: </p>
  
  <pre><code>driver.execute_script("document.body.style.zoom='0.4'")
  </code></pre>
  
  <p>Didn't worked.
  Tried to do it via Selenium -- find element and change CSS:</p>
  
  <pre><code>myDynamicElement = driver.find_elements_by_id("stream")
  </code></pre>
  
  <p>or find the image and click it with:</p>
  
  <pre><code>driver.find_element_by_xpath('//img[@src="../pics/button_downsize_27x27px.gif"]').click()
  </code></pre>
  
  <p>or</p>
  
  <pre><code>driver.find_elements_by_xpath('//*[@img]').click()
  </code></pre>
  
  <p>or</p>
  
  <pre><code>driver.find_elements_by_tag_name('img').click()
  </code></pre>
  
  <p>The HTML page looks like this: </p>
  
  <pre><code>&lt;a href="JavaScript:zoom(8)" target="_self"&gt;&lt;img src="/pics/button_downsize_27x27px.gif" width="27" height="27" border="0" title="Scale down to 800 px width" alt="Scale down to 800 px width"&gt;&lt;/a&gt;
  
  &lt;td colspan="3" align="center"&gt;&lt;img id="stream" src="/mjpg/video.mjpg" width="2560" height="1920" border="0" alt="If no image is displayed, there might be too many viewers, or the browser configuration may have to be changed. See help for detailed instructions on how to do this."&gt;&lt;br&gt;&lt;/td&gt;
  </code></pre>
  
  <p>Tried with @title and @alt and even contain but nothing works.</p>
  
  <p>What am I doing wrong?!?! How to find and click on this image (/pics/button_downsize_27x27px.gif)?</p>