How to display image with javascript?

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You could make use of the Javascript DOM API. In particular, look at the createElement() method.

You could create a re-usable function that will create an image like so...

 function show_image(src, width, height, alt) {  
   var img = document.createElement("img");  
   img.src = src;  
   img.width = width;  
   img.height = height;  
   img.alt = alt;  
   // This next line will just add it to the <body> tag  
   document.body.appendChild(img);  
 }

Then you could use it like this...

 <button onclick=  
   "show_image('http://google.com/images/logo.gif',   
          276,   
          110,   
          'Google Logo');">Add Google Logo</button>

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