Is this script right?

[ff7chocoboknight]

I just need the script looked over for errors. It's a harpoon weapon.

PHP Code:

//#CLIENTSIDE
function onCreated() {
  client.max_harpo_ammo = 10;
  client.harpo_ammo=10;
  this.harpo_on = 0;
}
function onWeaponFired() {
  if (this.harpo_on = 0) {
    this.harpo_on = 1;
    if (this.harpo_on = 1 && client.harpo_ammo > 0) {
      replaceani("walk", "graalaxy_harpoon_walk");
      replaceani("graalaxy_harpoon_empty_walk", "graalaxy_harpoon_walk");
      replaceani("idle", "graalaxy_harpoon_idle");
      replaceani("graalaxy_harpoon_empty_idle", "graalaxy_harpoon_idle");
      replaceani("sword", "graalaxy_harpoon_shoot");
      replaceani("graalaxy_harpoon_empty_shoot", "graalaxy_harpoon_shoot");
    } else if (this.harpo_on = 1 && client.harpo_ammo = 0) {
      replaceani("walk", "graalaxy_harpoon_empty_walk");
      replaceani("graalaxy_harpoon_walk", "graalaxy_harpoon_empty_walk");
      replaceani("idle", "graalaxy_harpoon_empty_idle");
      replaceani("graalaxy_harpoon_idle", "graalaxy_harpoon_empty_idle");
      replaceani("sword", "graalaxy_harpoon_empty_shoot");
      replaceani("graalaxy_harpoon_shoot", "graalaxy_harpoon_empty_shoot");
    }
  } else if (this.harpo_on = 1) {
    this.harpo_on = 0;
    replaceani("graalaxy_harpoon_walk", "walk");
    replaceani("graalaxy_harpoon_empty_walk", "walk");
    replaceani("graalaxy_harpoon_idle", "idle");
    replaceani("graalaxy_harpoon_empty_idle", "idle");
    replaceani("graalaxy_harpoon_shoot", "sword");
    replaceani("graalaxy_harpoon_empty_shoot", "sword");
  }
}
function onKeyPressed(keycode, keychar) {
  if (this.harpo_on = 1 && keychar = "r") {
    if (client.harpo_ammo = 0) {
      setani("graalaxy_harpoon_reload", " ");
      client.harpo_ammo = client.max_harpo_ammo;
    }
  }
  if (keychar = "s" && client.harpo_ammo > 0) {  
  client.harpo_ammo -= 1;
  setshootparams("damage", 3);
  temp.shootangle = getangle(vecx(player.dir), vecy(player.dir));
  shoot(player.x+vecx(player.dir), player.y+vecy(player.dir), player.z, temp.shootangle, 0, 0, "graalaxy_harpoon_arrow", NULL);
  }
}