Yes, you can create a hyperlink to a specific worksheet in an Excel 2007 file. Here's how:

1. Open the Excel file and navigate to the worksheet you want to link to.
2. Right-click on the sheet tab and select "Rename" to give the worksheet a name that you can use in the hyperlink.
3. Click on any cell in the worksheet to make it active.
4. Click on the "Home" tab in the ribbon and then click on the "Name box" (the box to the left of the formula bar that displays the cell reference).
5. Type the name you gave the worksheet in step 2 and press Enter. This will select the entire worksheet.
6. Right-click on the selected area and choose "Copy" from the context menu.
7. Open the webpage in Frontpage 2003 where you want to create the hyperlink.
8. Highlight the text or image that you want to turn into a hyperlink.
9. Click on the "Insert Hyperlink" button in the toolbar (or right-click and choose "Hyperlink" from the context menu).
10. In the "Address" field, type the full path to the Excel file, followed by a pound sign (#) and the name of the worksheet you want to link to. For example: C:\Documents\filename.xlsx#worksheetname
11. Click "OK" to create the hyperlink.

When someone clicks on the hyperlink, it should open the Excel file and take them directly to the specified worksheet. Note that the path to the Excel file may need to be adjusted depending on where the file is located on your computer or network.