Urgent! hittest/jump problem!

Can someone please take a look at my file and see what is the problem. I am trying to make a game which is due tomorrow and i still ain’t fixed the problem. I am gessing it is either the jump code or the hittest code. I am quite new to flash so it is quite difficult for me.

What happens is that when the character jumps when it lands it either goes into the ground when that it’s standing on, does the jump properly or does continous little jumps. Just check out my file and you will understand.
And I am using Flash 8.

Please can someone reply today

Thank You