codice:
<form >
<img id="output1" src="demo.gif" >
<input name="File"   type="file" accept=".jpg, .jpeg" onchange="loadFile(event,1)" >
</form>
Poi ripeti i form n volte 
<script type="text/javascript" >
  var loadFile = function(event,n) {
    var reader = new FileReader();
    reader.onload = function(){
      var output = document.getElementById('output'+n);
      output.src = reader.result;
    };
    reader.readAsDataURL(event.target.files[0]);
  };
</script>