How to add or change the image on logon screen

Steps to change the default SAP IMAGE 

* Transaction code - SMW0
* X - Binary data for WebRFC application
* Hit Enter
* Click Execute
* Click Settings -> Maintain MIME types
* Click the Create button
* Fill in :- TYPE : image/gif EXTENSION : .GIF
* Click Save
* Click Back to the Binary data for WebRFC
* Click Create
* Fill in :- Obj. name : ZXXXX.GIF Description :
* Company Logo
* Click Import and specify the filename where your
* GIF file is
* located.File type is BIN. Finish press the
* Transfer button.
* If successful, your logo will be shown in the
* Binary data for
* WebRFC.
* Transaction code SM30 - Table/View - SSM_CUST
* Click Maintain
* Click New Entries
* Name Value to be set
* START_IMAGE ZXXXX.GIF
* RESIZE_IMAGE NO
* Logoff and Login again