Cracked iPhone 3G and 3GS screen

You can pay for an out of warranty replacement. You can look at the iphones service FAQ or call Apple for prices.

You can find 3rd party repair facilities as well.

Apple doesn't offer a menu of repair services for the iPhone except for replacing the battery after the warranty has expired.

Apple does offer an out of warranty or not covered under the warranty "repair" price, which pays for an exchange for another iPhone - same model at a discounted price off the full retail or no-contract sales price which costs $199 plus tax if you are in the U.S. More than just the glass may be damaged and needs to be replaced. The out of warranty or not covered under the warranty "repair" price does not require signing a new contract with AT&T.

"i just want my screen fix.. and some other things on my iphone and i want to know if Apple will fix it"

I answered your question. They will replace it under the out of warranty, or you can get a 3rd party to repair. These are your options other than buying a new one or doing it yourself.