Hi Gunther,
hier hab ich mal den vollständigen, funktionierenden Code (selbst ausprobiert im IE9 mit dem Versatzfehler).
<!DOCTYPE html>
<html lang="en-us">
<head>
<title>Index</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!--<meta http-equiv="X-UA-Compatible" content="IE=8" />-->
<script type="text/javascript">
function getPosition(obj) {
var topValue = 0, leftValue = 0;
while (obj) {
leftValue += obj.offsetLeft;
topValue += obj.offsetTop;
obj = obj.offsetParent;
}
finalvalue = leftValue + "," + topValue;
return finalvalue;
}
function CreateDiv(obj) {
var pos = getPosition(obj);
var posarray = pos.split(",");
var offset = obj.offsetHeight;
var width = obj.offsetWidth;
/* create & define div container */
var newdiv = document.createElement('div');
var divIdName = 'mDivCBox';
newdiv.setAttribute('id', divIdName);
newdiv.style.position = "absolute";
newdiv.style.top = (parseInt(posarray[1]) + parseInt(1)) + 'px';
newdiv.style.left = (parseInt(posarray[0]) + parseInt(1)) + 'px';
newdiv.style.top = (parseInt(posarray[1])) + 'px';
newdiv.style.left = (parseInt(posarray[0])) + 'px';
newdiv.style.width = (parseInt(width)) + 'px';
newdiv.innerHTML = '<div id="cbox_div"><ul id="cdiv_ul" class="cdiv_ul"><li>first item</li><li>second item</li><li>third item</li><li>four item</li></ul></div>';
/* wrapper div container will contain our new div */
var ni = document.getElementById('wrapper');
ni.appendChild(newdiv);
/* add specific padding-value */
var select_ul = document.getElementById('cdiv_ul');
select_ul.style.marginTop = parseInt(offset) + 'px';
}
</script>
<style type="text/css">
.cbox_div
{
display:block;
background-color:transparent;
}
.cdiv_ul {
background:#aaa;
list-style:none;
border: 1px solid #000;
border-top-width:0px;
border-top:none;
cursor:default;
}
.cdiv_ul li:hover
{
background:#dcdcdc;
}
.cdiv_ul li {padding-left:1px; }
table {
border-collapse: collapse;
/*border:1px solid #000;*/
/*border-right-width:0px;
border-bottom-width:0px;
border-bottom:none;
border-right:none;*/
}
td, th
{
padding:2px;
border: 10px solid #000;
height:60px;
}
thead th {
text-align: center;
background: #787878;
color: #000;
}
.combotext
{
background: url("../images/dd_bk.png") repeat-x;
height:100%;
margin-right:21px;
padding:0px 2px 0px 2px;
text-align:left;
}
.combobild
{
float:right;
border-left:1px solid #747373;
border-right:none;
background: url("../images/dd_img.png") no-repeat;
width:21px;
height:100%;
}
.cdiv
{
/* display:block; macht das hier Sinn??? */
border: 1px solid #000;
height: 24px;
text-align:center;
vertical-align: middle;
line-height: 24px;
}
</style>
</head>
<body>
<div class="wrapper" id="wrapper">
<div class="tablecontainer">
<table>
<thead>
<tr>
<th>Hdr1</th>
<th>Hdr2</th>
<th>Hdr3</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<div class="cdiv" onclick="CreateDiv(this);">
<div class="cbild">
</div>
<div class="ctext">
<span class="as_cui_t">Auswahl:</span>
</div>
</div>
</td>
<td>
<div class="cdiv" onclick="CreateDiv(this);">
<div class="combobild">
</div>
<div class="combotext">
<span class="as_cui_t">Auswahl2:</span>
</div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</body>
</html>