screen problem

i have a problem with a command i typed. somone gave me a command,he said it would make me jump higher but instead it made my screen sort of stretched . u like see every thing so far away
but u can still play but u dont know were ur going .the command started with a cv or somthing with a c . can someone help me .in the mean while i ncant play the game so hurry pls

theres a lot of server commands that start with CV. So unless someone knows this offhand its gonna be hard to fix.