How to calculate the size of an iFrame Back

var calcPageHeight = function(doc) {
    var cHeight = Math.max(doc.body.clientHeight, doc.documentElement.clientHeight);
    var sHeight = Math.max(doc.body.scrollHeight, doc.documentElement.scrollHeight);
    return Math.max(cHeight, sHeight);

var calcPageWidth = function(doc, win) {
    if (!!win.ActiveXObject && doc.documentMode <= 8 && doc.compatMode === 'CSS1Compat') {
         * extract the minimal value under IE compatible mode,
         * so that the scroll bar won't be outside the container
        var cWidth = Math.min(doc.body.clientWidth, doc.documentElement.clientWidth);
        /** also set body width to fix existence of scrollbars. */
        // = cWidth - 30 + 'px';

        return cWidth;
    } else {
        return Math.max(doc.body.clientWidth, doc.documentElement.clientWidth);
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