[excaliber7388]

Here's what I have now. The bouncing bug is gone, but the player still goes into the ground on occasion, and sometimes, I fall through moving NPCs.
It works as well as other gravity systems I've seen, so I guess it could be a free script, only I want to improve it. I also plan to change the rate of acceleration for falling, to make it reach the max speed slower, so you can notice the acceleration.

PHP Code:

// NPC made by Excalibur
//GS2 Grav
//#CLIENTSIDE
function onCreated()
{
  client.no_wep=1;
  player.dir=3;
  this.direction=player.dir;
  this.speed=.05;
  onTimeout();
}
function onTimeout()
{
  freezeplayer(.05);
  //set the jump
  if(keydown(0) && this.jump==0 && onwall(player.x+1, player.y+3.55))
  {
    this.speed=.05;
    this.jump=1;
    this.count=17;
  }
  //force fall
  if(keydown(2))
  {
    if(!onwall(player.x+1, player.y+3.55) && !onwall(player.x+1, player.y+this.speed))
    {
      playery+=(this.speed-.05);
    }
  }
  if(keydown(1))
  {
    if(onwall(player.x+1, player.y+3.55))
    {
       setani("walk",NULL);
    }
    if(!onwall(player.x-.5,player.y) && !onwall(player.x-.5,player.y+3))
    {
      player.x-=.5;
    }
    player.dir=1;
  }
  if(keydown(3))
  {
    if(onwall(player.x+1, player.y+3.55))
    {
       setani("walk",NULL);
    }
    if(!onwall(player.x+2.5,player.y) && !onwall(player.x+2.5,player.y+3))
    {
      player.x+=.5;
    }
    player.dir=3;
  }
  else if(!keydown(1) && !keydown(3))
  {
    setani("idle",NULL);
  }
  //move
  if(player.dir==0 || player.dir==2)
  {
    player.dir=this.direction;
  }
  this.direction=player.dir;
  if(this.jump==1)
  {
    if(!onwall(playerx+1,playery-.5) && this.count>0)
    {
       player.y-=.5;
    }
    else if(onwall(playerx+1,playery-.5))
    {
      this.count=0;
    }
    this.count--;
    if(this.count<=0)
    {
      this.jump=0;
      this.count=0;
    }
  }
  //falling
  if(!onwall(player.x+1, player.y+3.55) && !onwall(player.x+1, player.y+this.speed+.05) && !onwall(player.x, player.y+3.55) && !onwall(player.x, player.y+this.speed+.05) && !onwall(player.x+2, player.y+3.55) && !onwall(player.x+2, player.y+this.speed+.05))
  {
    if(!this.jump==1)
    {
      player.y+=this.speed;
    }
    if(this.speed<5)
    {
      this.speed+=.05;
    }
  }
  else  if(onwall(player.x+1, player.y+3.5) || onwall(player.x+1, player.y+this.speed) || onwall(player.x, player.y+3.5) || onwall(player.x, player.y+this.speed) || onwall(player.x+2, player.y+3.5) || onwall(player.x+2, player.y+this.speed))
  {
    this.speed=.05;
  }
  settimer(.05);
}