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Equation of a Projectile - Jumping

Viridian (2)
I am working on a program that needs an object to jump, I have been using this piece of code to make work function.

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	if (Jump == 1)	{
		//Jump
		DeltaTime /= 1000;
		ElapsedKeyTime += DeltaTime;
		if (ElapsedKeyTime < JumpTime)	{
			PlayerPositionY += StartVelocity * ElapsedKeyTime + 0.5 * Gravity * ElapsedKeyTime * ElapsedKeyTime;
			//if (PlayerPositionY > JumpHeight) PlayerPositionY = JumpHeight;

		}

		if (ElapsedKeyTime > JumpTime)	{
			PlayerPositionY -= 0.5 * Gravity * (ElapsedKeyTime - JumpTime) * (ElapsedKeyTime - JumpTime);
			if (PlayerPositionY < (WindowHeight / 10))	{
				PlayerPositionY = WindowHeight / 10;
				Jump = 0;
				ElapsedKeyTime = 0;
			
			}

		}
				
	}


Improvements?
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