Show enlarged picture when mouse hover over an image

Question

On my webpage, I want to put an image such that when the mouse pointer hovers over that image, an enlarged version will appear.

Answer 1

Updated CSS solution based on further explanation of the requirement in the comments

http://jsfiddle.net/5sRTX/7/

<div class="effectback">
<img class="effectfront" src="https://farm8.staticflickr.com/7042/6873010155_d4160a32a2.jpg" />
</div>

attribution<br/>
https://secure.flickr.com/photos/34022876@N06/6873010155/sizes/m/in/photostream/

.effectback {
  display: block;
  background: url('https://farm8.staticflickr.com/7042/6873010155_d4160a32a2_s.jpg') no-repeat;
    margin: 0 auto;
}
.effectfront {
  opacity: 0;
  border: none;
  margin: 0 auto;
}
.effectfront:hover {
  opacity: 1;
  transition: all 0.3s;
  -webkit-transition: all 0.3s;
}

Original css solution based on the original question

CSS solution

http://jsfiddle.net/ERh62/1/

.effectscale {
  border: none;
  margin: 0 auto;
}
.effectscale:hover {
  -webkit-transform: scale(1.2);
  -moz-transform: scale(1.2);
  -o-transform: scale(1.2);
  transform: scale(1.2);
  transition: all 0.3s;
  -webkit-transition: all 0.3s;
}