I've finally found a solution to my problem.

        setIframeHeight: function() {
                var innerDoc = (this.iframeElement.contentDocument) ?
                this.iframeElement.contentDocument :
                this.iframeElement.contentWindow.document;
                var h = innerDoc.body.scrollHeight;
                this.iframeElement.setStyle("height", h);
        }

should change to

        setIframeHeight: function() {
                this.iframeElement.setStyle("height", 1px); //new line
added
                var innerDoc = (this.iframeElement.contentDocument) ?
                this.iframeElement.contentDocument :
                this.iframeElement.contentWindow.document;
                var h = innerDoc.body.scrollHeight;
                this.iframeElement.setStyle("height", h);
        }

This is not a solution to the onbeforeonload event problem but a
solution to the dynamic iframe problem.

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