Function getCumulativeOffset

perfmap.js:133–150

(obj, url)

}

function getCumulativeOffset(obj, url) {
    var left, top;
    left = top = 0;
    if (obj.offsetParent) {
        do {
            left += obj.offsetLeft;
            top  += obj.offsetTop;
        } while (obj = obj.offsetParent);
    }
    if ( 0 == top ) {
        left += gZeroLeft;
        top += gZeroTop;
    }
    return {
        left: left,
        top: top,
    };
}

// give visual feedback asap
var loading = document.createElement("div");