Problem in popup image window

please in code: can mouse roll on , on click on emotions url, image opening in new window.

but want instead of url should open image rollover numb nail (emo.gif)

 

<script type="text/javascript">

// pre load images rollover

if (document.images) {

    emo = new image;

    emodiff = new image;

 

    emo.src = "images/emo.gif";

    emodiff.src = "images/emodiff.gif";

}

function swapimage(thisimage,newimage) {

    if (document.images) {

        document[thisimage].src = eval(newimage + ".src");

    }

}

</script>   

<a href="/html/codes/" onmouseover="swapimage('jack','emodiff')" onmouseout="swapimage('jack','emo')"><img src="images/emo.gif" width="80" height="60" border="0" name="jack"></a>

 

<script language="javascript">

var popupwindow = null;

function centeredpopup(url,winname,w,h,scroll){

leftposition = (screen.width) ? (screen.width-w)/2 : 0;

topposition = (screen.height) ? (screen.height-h)/2 : 0;

settings =

'height='+h+',width='+w+',top='+topposition+',left='+leftposition+',scrollbars='+scroll+', resizable'

popupwindow = window.open(url,winname,settings)

}

</script>

<p><a href="imagegallery_files/vlb_images1/emotions.jpg" onclick="centeredpopup(this.href,'mywindow','810','574','yes');return false">emotions</a></p>

please post in our coder corners forum :

https://forums.adobe.com/community/coding-corner

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