javascript image fade on click


I want to create an image fade when a link is pressed. At the moment i have set it up so that when you click a link the image is swapped to the new one, but how can i make the new image fade in with javascript?

code i have so far is just:
function swap(eid, image) {
  var element = document.getElementById(eid);

<a onclick="swap('slideshow', 'serv_catering2.jpg');">1</a>

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function fadeMe()
    document.getElementById("imgSample").filters[0].opacity= 50//increase or decrease this value for fading.;
    <form id="form1" runat="server">
       <img alt="" id="imgSample" src="logo.jpg" width="116" height="123"
        <input type="button" onclick="fadeMe();" />

isn't that filter only for ie?

jquery is the way to go
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