Ryk DIV-layer, gem kordinater.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script type="text/javascript">
ie = (document.all) ? true : false;
var active = false;
var boxX,boxY;
function beginDrag(boxName,evnt)
{
    if (!active)
    {
        active = true;
        boxX = (ie) ? evnt.offsetX : evnt.layerX;
        boxY = (ie) ? evnt.offsetY : evnt.layerY;
        boxName.style.zIndex = 2;
    }
        else;

}
function moveBox(boxName,evnt)
{
        boxStyle = boxName.style;
        moveable = true;
    x = (ie) ? evnt.clientX : evnt.pageX;
    y = (ie) ? evnt.clientY : evnt.pageY;
    x = x-boxX;
    y = y-boxY;
    if (active)
    {
                if (moveable)
                {
                    boxStyle.left = x + "px";
                    boxStyle.top = y + "px";
                }
    }
        else;
}
function endDrag(boxName)
{
    if (active)
        {
            active = false;
            boxName.style.zIndex = 1;
            document.form1.x.value = boxName.style.left;
            document.form1.y.value = boxName.style.top;
        }
}
</script>
</head>
<body>
<div id="boks" style="position:absolute;left:0px;top:0px;width:100px;height:100px;background:#f00;" onmousedown="beginDrag(this,event);" onmousemove="moveBox(this,event);" onmouseup="endDrag(this);">DRAG ME</div>
<form name="form1">
<input type="text" name="x" />
<input type="text" name="y" />
</form>
</body>
</html>

hov hvis input felterne skal hedde top og left, så skal det jo være:
function endDrag(boxName)
{
    if (active)
        {
            active = false;
            boxName.style.zIndex = 1;
            document.form1.left.value = boxName.style.left;
            document.form1.top.value = boxName.style.top;
        }
}
<form name="form1">
<input type="text" name="left" />
<input type="text" name="top" />
</form>

Thank you :), lav et svar.

okay :-)