var IFrameHelper = { getBodyHeight : function(doc) { var height = null; var scrollHeight; var offsetHeight; if (doc.height) { height = doc.height; } else if (doc.body) { if (doc.body.scrollHeight) height = scrollHeight = doc.body.scrollHeight; if (doc.body.offsetHeight) height = offsetHeight = doc.body.offsetHeight; if (scrollHeight && offsetHeight) height = Math.max(scrollHeight, offsetHeight); } return height; } }; // Usage: