My Inspiron 1545 is working fine......but the bottom right corner cracked open, and the top right corner also cracked open....but not to much.

Okay so my Inspiron fell off the top of my bunkbed and the top left corner cracked alittle. The top right corner cracker but not all the way. The bottom right corner opened up....but not very much. and also the bottom left corner kinda chipped off.....nothing bad......the laptop works perfect. I wanted to know which warranty i can get to cover this damage. HELP PLEASE!