there is a way to find x and y of a element
var thepoint = myfunc_GetXY(myIframe.contentWindow.document.getElementById("some_Element"));
myIframe.contentWindow.scrollTo(thepoint.x, thepoint.y)
or use :
myIframe.contentWindow.document.getElementById("some_Element").scrollIntoWiew()
function myfunc_GetXY(aTag)
{
var oTmp = aTag;
var pt = new Point(0, 0);
do
{
pt.x += oTmp.offsetLeft;
pt.y += oTmp.offsetTop;
oTmp = oTmp.offsetParent;
} while (oTmp && oTmp.tagName != "HTML" && oTmp.tagName != "BODY");
return pt;
}