var my_height;
var jump_height = 55;
var jump_target; 
var gravity = 3;


function my_gravity()
{
my_height = c_trace(my.x,vector(my.x,my.y,my.z-10000),USE_BOX|IGNORE_PASSABLE|IGNORE_ME);

   if(my_height > 5)
   {
   	accelerate(player_movement.z,-gravity*time_step,0.1); 
   }    
   else
   {
   	player_movement.z=-(my_height/1.2)+2;
   	if((my_height + player_movement.z) > 5){player_movement.z = - my_height - 5;}
   	if(key_space == 1){jump_target = jump_height;} 
   } 
   if(jump_target > 5)
   {
   	player_movement.z = ( sqrt((jump_target)*gravity) ) * time_step;
   	jump_target -= player_movement.z;
   	
   }
}