Hi my girlfriend just gave me this toaster, and would like to know what the lighted buttons are for thanks

Since you don't mention the make or model number of the toaster or its age I can only make the following guesses.
It might be an electronic model. To test if this is the case, leave the toaster unplugged and push the lever of the toaster down. If it does not stay down it is an electronic toaster. If it stays down then it is NOT electronic.
The lights might be lighted push buttons.
If you plug the toaster in then put a slice of bread or two in and push the lever handle down and one light comes on then this is probably a dual purpose pushbutton. It indicates that the heating elements are on and if you push it will cancel the toasting cycle and the bread slices should pop up.
If there is a button beside the above button it could be for extending the toaster cycle time a bit longer to compensate for a thicker slice or a denser bread like a bagel. If you push it, it will light up to let you know that the cycle has been extended for this reason.
If there is a button beside this one, it could be for extending the toasting cycle to compensate for a frozen slice of bread or whatever, like a bagel or even a frozen waffle.
If you find the make and model for your toaster, it might be on the bottom somewhere, google it to see if you can download an instruction manual for it.
Hope this helps. Good Luck.