I want to show all image preview but whenever I upload a new one the old one is gone

​<input type="file" multiple="true" id="files" />
<input type="submit" id="go"/>
<div id="images"></div>​​​​​​​​​​​​​​​​​​​​​​

// set up variables
var reader = new FileReader(),
    i=0,
    numFiles = 0,
    imageFiles;

// use the FileReader to read image i
function readFile() {
    reader.readAsDataURL(imageFiles[i])
}

// define function to be run when the File
// reader has finished reading the file
reader.onloadend = function(e) {

    // make an image and append it to the div
    var image = $('<img>').attr('src', e.target.result);
    $(image).appendTo('#images');

    // if there are more files run the file reader again
    if (i < numFiles) {
        i++;
        readFile();
    }
};

$('#go').click(function() {

    imageFiles = document.getElementById('files').files
    // get the number of files
    numFiles = imageFiles.length;
    readFile();           

});

<input type="file" id="files" />
<img id="image" />

document.getElementById("files").onchange = function () {
    var reader = new FileReader();

    reader.onload = function (e) {
        // get loaded data and render thumbnail.
        document.getElementById("image").src = e.target.result;
    };

    // read the image file as a data URL.
    reader.readAsDataURL(this.files[0]);
};

function handleFileSelect(evt) {
    var files = evt.target.files;

    // Loop through the FileList and render image files as thumbnails.
    for (var i = 0, f; f = files[i]; i++) {

      // Only process image files.
      if (!f.type.match('image.*')) {
        continue;
      }

      var reader = new FileReader();

      // Closure to capture the file information.
      reader.onload = (function(theFile) {
        return function(e) {
          // Render thumbnail.
          var span = document.createElement('span');
          span.innerHTML = 
          [
            '<img style="height: 75px; border: 1px solid #000; margin: 5px" src="', 
            e.target.result,
            '" title="', escape(theFile.name), 
            '"/>'
          ].join('');
          
          document.getElementById('list').insertBefore(span, null);
        };
      })(f);

      // Read in the image file as a data URL.
      reader.readAsDataURL(f);
    }
  }

  document.getElementById('files').addEventListener('change', handleFileSelect, false);

<input type="file" id="files" multiple />
<output id="list"></output>

function readURL(input) {
    if (input.files && input.files[0]) {
        var reader = new FileReader();

        reader.onload = function (e) {
            $('#blah').attr('src', e.target.result);
        }

        reader.readAsDataURL(input.files[0]);
    }
}

$("#imgInp").change(function(){
    readURL(this);
});