function getElemPos(elem)
{
var offTrial=elem;
var offL=0;
var offT=0;

while(offTrial)
{
offL+=offTrial.offsetLeft;
offT+=offTrial.offsetTop;
offTrial=offTrial.offsetParent;
}

if (navigator.userAgent.indexOf("Mac")!=-1 && typeof document.body.leftMargin!="undefined")
{
offL+=document.body.leftMargin;
offT+=document.body.topMargin;
}

return {left:offL , top:offT}
}