<SCRIPT language="JavaScript">
<!--
if (document.images) {
var pArray = new Array()
// Picture Array 
// syntax: pArray[n] = "picturename"
pArray[0] = "images/1.jpg"
pArray[1] = "images/2.jpg"
pArray[2] = "images/3.jpg"
pArray[3] = "images/4.jpg"
pArray[4] = "images/5.jpg"
pArray[5] = "images/6.jpg"
pArray[6] = "images/7.jpg"
// end of pictureArray
var imageDB = new Array()
for (i=0; i < pArray.length; i++)
{
    var n = pArray[i].substring(0, pArray[i].indexOf("."))
    var e = pArray[i].substring(pArray[i].indexOf("."),  pArray[i].length)
    //imageDB[n] = new Image(h,w)
    imageDB[n] = new Image()
    imageDB[n].src = n + e
}
}
function switchImg(imgname,description,imgsource){
window.status = description;
if ( document.images )
        {
        evalstring = "document." + imgname + ".src = imgsource";
        eval(evalstring);
        }
}
// -->
  </SCRIPT>
 <MAP NAME="mapMap7">
    <AREA SHAPE="rect" COORDS="24,9,70,39" HREF="#" onmouseover="switchImg('zoomin','','images/1.jpg'); return true;">
    <AREA SHAPE="rect" COORDS="71,10,114,40" HREF="#" onmouseover="switchImg('zoomin','','images/2.jpg'); return true;">
    <AREA SHAPE="rect" COORDS="116,11,152,39" HREF="#" onmouseover="switchImg('zoomin','','images/3.jpg'); return true;">
    <AREA SHAPE="rect" COORDS="139,41,189,75" HREF="#" onmouseover="switchImg('zoomin','','images/7.jpg'); return true;">
    <AREA SHAPE="rect" COORDS="97,41,137,74" HREF="#" onmouseover="switchImg('zoomin','','images/6.jpg'); return true;">
    <AREA SHAPE="rect" COORDS="54,41,97,75" HREF="#" onmouseover="switchImg('zoomin','','images/5.jpg'); return true;">
    <AREA SHAPE="rect" COORDS="13,40,54,77" HREF="#" onmouseover="switchImg('zoomin','','images/4.jpg'); return true;">
</MAP><IMG SRC="images/0.jpg" WIDTH="200" HEIGHT="80" ALIGN="BOTTOM"
            USEMAP="#mapMap7" BORDER="0" NATURALSIZEFLAG="0" ISMAP>
Dette har jeg fundet på 
http://www.vw.dk under "New Beetle" Jeg har selv anvendt det på andre sider...