function getDocumentSize(doc) { // getting a real size document with scrolling etc.
	var r = { width: 0, height: 0 };

	
	var width1=0, width2=0, width3=0, width4=0, maxWidth=0;
	var height1=0, height2=0, height3=0, height4=0, maxHeight=0;
	
	
	if (doc.width) maxWidth = doc.width;	
	if (doc.body) {		
		if (doc.body.scrollWidth) width1 = doc.body.scrollWidth;
		if (doc.body.offsetWidth) width2 = doc.body.offsetWidth;		
	}
	if (doc.documentElement) {
		width3 = doc.documentElement.scrollWidth;		
		width4 = doc.documentElement.clientWidth;
	}	
	
	maxWidth = Math.max(Math.max(Math.max(width1, width2), Math.max(width3, width4)),maxWidth);
		
	if (doc.height) maxHeight = doc.height;
	if (doc.body) {
		if (doc.body.scrollHeight) height1 = doc.body.scrollHeight;
		if (doc.body.offsetHeight) height2 = doc.body.offsetHeight;
  	}
	if (doc.documentElement) {
		height3 = doc.documentElement.scrollHeight;
		height4 = doc.documentElement.clientHeight;
	}
	maxHeight = Math.max(Math.max(Math.max(height1, height2), Math.max(height3, height4)),maxHeight);
	
	r.width = maxWidth;
	r.height = maxHeight;
	
	return r;
}