If you have the documents in a folder, then there is nothing tricky about it.
<iframe src="document.doc" width="300" height="300"></iframe>
You can adjust the width and height or leave them out completely. Keep in mind that not everyone will see the page the same way. Not all browsers support doc and pdf files inside the browser. Users can also choose to deny doc and pdf opening inside the browser, even if they have both Word and Acrobat Reader installed.