Im Head:


<!-- generelle schriftformatierung für die Box -->
<style type="text/css">
<!--
td {
font-family:arial,helvetica;
font-size:12px;
color:#000000;
}
-->
</style>

<script type="text/javascript" language="JavaScript">
<!-- Original:  Patrick Lewis, mod: W. Jansen -->
<!--

if (document.layers) {navigator.family = "nn4"}
if (document.all) {navigator.family = "ie4"}
if (window.navigator.userAgent.toLowerCase().match("gecko")) {navigator.family = "gecko"}

descarray = new Array(

"Bild1",
"Bild2"

);

overdiv="0";
function popLayer(a){
if(!descarray[a]){descarray[a]="<font color=red>Dieses PopUp (#"+a+") ist nicht korrekt definiert - Beschreibung fehlt</font>";}
if (navigator.family == "gecko") {pad="0"; bord="1 bordercolor=black";}
else {pad="1"; bord="0";}
desc = "<table cellspacing=0 cellpadding="+pad+" border="+bord+"  bgcolor=000000><tr><td>\n"
       +"<table cellspacing=0 cellpadding=10 border=0 width=100%><tr><td bgcolor=#DDFFFF><center><font size=-1>\n"
       +descarray[a]
       +"\n</td></tr></table>\n"
       +"</td></tr></table>";
if(navigator.family =="nn4") {
       document.object1.document.write(desc);
       document.object1.document.close();
       document.object1.left=x+15;
       document.object1.top=y-5;
       }
else if(navigator.family =="ie4"){
       object1.innerHTML=desc;
       object1.style.pixelLeft=x+15;
       object1.style.pixelTop=y-5;
       }
else if(navigator.family =="gecko"){
       document.getElementById("object1").innerHTML=desc;
       document.getElementById("object1").style.left=x+15;
       document.getElementById("object1").style.top=y-5;
       }
}

function hideLayer(){
if (overdiv == "0") {
       if(navigator.family =="nn4") {eval(document.object1.top="-500");}
       else if(navigator.family =="ie4"){object1.innerHTML="";}
       else if(navigator.family =="gecko") {document.getElementById("object1").style.top="-500";}
       }
}

var isNav = (navigator.appName.indexOf("Netscape") !=-1);
function handlerMM(e){

// entweder feste x/y-Position für die Info-Box
// x = 300; // Infobox x-Position bei 300 von links
// y = 0;   // Infobox y-Position bei 0 (oben)

// oder Plazierung neben Mauszeiger
x = (isNav) ? e.pageX : event.clientX + document.body.scrollLeft;
y = (isNav) ? e.pageY : event.clientY + document.body.scrollTop;

}
if (isNav){document.captureEvents(Event.MOUSEMOVE);}
document.onmousemove = handlerMM;
//  End -->
</script>


im Body:


<!-- ::::::::::::::::::::: div-definition :::::::::::::::::::::::-->
<div id="object1" style="position:absolute; background-color:FFFFDD;color:black;border-color:black;border-width:20; visibility:show; left:25px; top:-100px; z-index:+1" onmouseover="overdiv=1;"  onmouseout="overdiv=0; setTimeout('hideLayer()',1000)">
pop up description layer
</div>
<!-- ::::::::::::::::::::: /div-definition :::::::::::::::::::::::-->