It sounds like you are applying the watermark to individual pages instead of the entire document. Here's how you can add a watermark to all pages in Word 2007:
- Click on the Page Layout tab in the ribbon.
- Click on the Watermark button in the Page Background group.
- Select the watermark you want to use from the gallery or click on Custom Watermark to create your own.
- In the Printed Watermark dialog box, select the option for "Picture watermark".
- Click on the Select Picture button and choose the image you want to use as the watermark.
- Adjust the Scale and Washout options as desired.
- Make sure the "Apply to" drop-down menu is set to "Whole document".
- Click on OK to apply the watermark to all pages in your document.
By following these steps, you should be able to add a watermark to all pages in your document without it disappearing from any of them.