Wow !! itz a amazing experience to change my grub splash screen , for those who don't know about it, I write the procedure to change the grub splash screen
for Changing the grub splash screen you have to follow these steps
1)Download the splash. screen from http://schragehome.de/splash/
2)$ su -
3)Edit the grub file # vi /boot/grub/menu.lst
4)give the proper link for the splash.xpm.gz
5)reboot
now check that your splash screen has changed
:-fat0ss
