i want that slider which helps to unlock the iPhone in my app, but i m getting that standard slider.Please tell me is there any way to change that standard slider or there
You have to make your own one using NSView and finger tracking. There is no Apple provided class for that in the SDK.
Also this might be of help:
http://www.iphonedevsdk.com/forum/iphone-sdk-development/11470-there-way-i-can-use-slide-unlock-slider.html