Navigate the the location below in your registry and make the corresponding change.
The value should be set to the fill path to the bmp file you wish to you, for example: c:\windows\image.bmp.
Restart Internet Explorer for the change to take effect.
Delete these values to set the background to its default settings.
Key: [HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Toolbar]
Name: BackBitmap
or BackBitmapIE5
Data Type: REG_SZ
