I need to write a simple document in MS Word (2007). The document must contain an image and the width of the image shoul be equal to page width (i.e. if the page width changes, the image width changes too). The document should be HTML type, hence all I need is to insert something equal to 

```
<img src="image.jpg" width=100%>

```

Is it possible? And how?

Why I need it? I want to use MS Word Mail Merge in order to send several e-mail via MS Outlook, hence I have to prepare the e-mail text in MS Word first.