idesign_bk.jpg is the background image for the landing page. It is the grey rectangle with the 'The length unit ... " text.

You can change this default background as well as changing the unit to inch, centimeter, meter.. or what ever you want by just replacing this idesign_bk.jpg.

To change the idesign_bk.jpg, please follow these steps:

1. Download the idesign_bk.ai here(Adobe Illustrator vector file). Open it with AI.

2. Edit the text for unit you want.

3. Choose File/Export to export it as Flash file. Name it idesign_bk.swf

4. Rename the file extension to .jpg. The file name should be 'idesign_bk.jpg' by now.

5. Upload that idesign_bk.jpg file into your server to replace the old IDesign/idesign_bk.jpg file.

6. Clear your browser cache to see the landing page background updated.