How to make humanoid Jumped event longer???

How can I make the gravity of a single object in workspace change?

-- set gravitational pull to 0
script.Parent.BodyForce.force = Vector3.new(0, game.Workspace.Gravity, 0) * script.Parent:GetMass() --Body Force doesn;t work anymore sadily so how can I do this?

http://wiki.roblox.com/index.php?title=Gravity

Mos tof the stuff here is depreciated, so help please?

Humanoid.JumpPower!

These can be used for non-players:

Experiment with these

(Scroll down to Inherited Classes)

If you insert a BodyThrust and set the Y value somehow proportional to the Mass, it will counteract gravity.

Otherwise, get admin commands and try the setgrav command and see what gets added to your character!

This is an example script for 1 part to negate gravity.

local BodyForce = Instance.new("BodyForce") -- makes a force useful for this 
BodyForce.force = Vector3.new(0, game.Workspace.Gravity, 0) * script.Parent:GetMass() -- makes BodyForce exert force equal to negative gravity * the weight of the part 
BodyForce.Parent = script.Parent

Add each part in a models mass to get the total mass and place the script in the root part or something.

As for deprecation; tested my self and works..