title: switch img src back again after jquery click
body: <p>i have managed to switch my crosshair to a minus using jquery but cannot write the query to reset on re-click. I'm trying and trying. The second/minus img is picked from the img directory.</p>
  
  <p>my HTML-</p>
  
  <pre><code>&lt;div id="button-1"&gt;&lt;img id="crosshair" src="img/plus.jpg" alt="plus"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>Jquery (initial)-</p>
  
  <pre><code>$('#crosshair').on({
  'click': function(){
      $('#crosshair').attr('src','img/minus.jpg');
  }
  });
  </code></pre>
  
  <p>thanks for any help!</p>