text: var myImage = document.querySelector('img');                      
  
  
  myImage.onclick = function() {                                   
  	var mySrc = myImage.getAttribute('src');                        
  	if(mySrc === 'https://greenblender.com/smoothies/wp-content/uploads/2016/05/does-grapefruit-help-you-lose-weight-by-greenblender-fruit.jpg') {                        
        myImage.setAttribute ('src','https://a.ltrbxd.com/resized/sm/upload/ad/c3/b3/xe/phantom-of-the-paradise-1200-1200-675-675-crop-000000.jpg?k=e2efc31cfc');       
  	} else if(mySrc === 'https://a.ltrbxd.com/resized/sm/upload/ad/c3/b3/xe/phantom-of-the-paradise-1200-1200-675-675-crop-000000.jpg?k=e2efc31cfc') {
  	    myImage.setAttribute ('src','https://lparchive.org/Zork-Grand-Inquisitor/Update%207/1-5guemainfountain.jpg'); 
  	} else {
         myImage.setAttribute ('src','https://greenblender.com/smoothies/wp-content/uploads/2016/05/does-grapefruit-help-you-lose-weight-by-greenblender-fruit.jpg');        
    }                                                            
  }
  
  var myButton = documentgetElementById('button');
  
  myButton.onclick = function() {                                   // mouse click calls 'setUserName()' function
  
  }