try these routines, they are pretty accurate:
function findPosY(obj){
var curtop = 0;
if (document.getElementById || document.all) {
while (obj.offsetParent) {
curtop += obj.offsetTop;
if (typeof(obj.scrollTop) == 'number')
curtop -= obj.scrollTop;
obj = obj.offsetParent;
}
}
else if (document.layers)
curtop += obj.y;
return curtop;
}
function findPosX(obj) {
var curleft = 0;
if (document.getElementById || document.all) {
while (obj.offsetParent) {
curleft += obj.offsetLeft
obj = obj.offsetParent;
}
}
else if (document.layers)
curleft += obj.x;
return curleft;
}
-- bruce (sqlwork.com)