function getLeft(oObject) {
var oNewObject;
var iResult = oObject.offsetLeft;
if (oNewObject = oObject.offsetParent){
iResult += getLeft(oNewObject);}
return iResult;
}

function getTop(oObject) {
var oNewObject;
var iResult = oObject.offsetTop;
if (oNewObject = oObject.offsetParent){
iResult += getTop(oNewObject);}
return iResult;
}




function setLayer(oSource) {

var bigpicbox_y = getTop(oSource);   
var bigpicbox_x = getLeft(oSource);  

document.getElementById("bigpicbox").style.top  = bigpicbox_y;
document.getElementById("bigpicbox").style.left = bigpicbox_x; 

}