get position of an element in the web (js)

scripts.js

trasweb.getPosition = function (el) {
    var xPos = 0;
    var yPos = 0;

    while (el) {
        if (el.tagName === "BODY") {
            // deal with browser quirks with body/window/document and page scroll
            var xScroll = el.scrollLeft || document.documentElement.scrollLeft;
            var yScroll = el.scrollTop || document.documentElement.scrollTop;

            xPos += (el.offsetLeft - xScroll + el.clientLeft);
            yPos += (el.offsetTop - yScroll + el.clientTop);
        } else {
            // for all other non-BODY elements
            xPos += (el.offsetLeft - el.scrollLeft + el.clientLeft);
            yPos += (el.offsetTop - el.scrollTop + el.clientTop);
        }

        el = el.offsetParent;
    }
    return {
        x: xPos,
        y: yPos
    };
};