Problems with animations please help? may be complicated..

I have a long jump animation, but if the player long jumps the animation doesn't stop when a part is touched and doesn't take the player to that part either, how do i fix this?? THE SCRIPT:

local player = game.Players.LocalPlayer

repeat wait() until player.Character.Humanoid 

local humanoid = player.Character.Humanoid


local mouse = player:GetMouse()





local anim = Instance.new("Animation")


anim.AnimationId = "http://www.roblox.com/asset/?id=1491234078" -- id of animation





=mouse.KeyDown:connect(function(key)



    if key == "z" then --Select a button, if you want shift then put 48 in it


        local playAnim = humanoid:LoadAnimation(anim)


        playAnim:Play()

   end

end)

thanks for your help