The button may have been removed accidentally. Here's how to restore a toolbar:
1) On the Tools menu, click Customize, and then click the Toolbars tab.
2) In the Toolbars box, click the name of the toolbar you want to restore.
3) Click Reset.
If that doesn't work, you might try to repair office:
1) Go to Help menu > Detect and Repair.
2) Select the appropriate check boxes in the Detect and Repair screen, then click Start.
Note: Discard my customized settings and restore default settings wil ensure the most complete repair, but as the name implies, you loose any and all custom views, fonts, toolbar settings, etc.
3) Insert the Office 2003 CD when prompted.
4) Detect and repair completes, usually with 5 minutes or so.
Matthew Clark
A+, MCP, MCSE, MOS Master, Network+