- Toggle's
 if(checkKey(Keyboard.KEY_G))
        {
            Ender.speed = !Ender.speed;
        }
        if(Ender.speed)
        {
            Timer.timerSpeed = 2.0F;
            fontrenderer.drawStringWithShadow((new StringBuilder()).append("\247aSpeed (2.0)").toString(), 2, 12, 0xff0000);
        }else
        {
            Timer.timerSpeed = 1.0F;
            fontrenderer.drawStringWithShadow((new StringBuilder()).append("\247cSpeed (Normall)").toString(), 2, 12, 0xff0000);
        }
        if(checkKey(Keyboard.KEY_Y))
        {
            Ender.highjump = !Ender.highjump;
        }
        if(Ender.highjump)
        {
            fontrenderer.drawStringWithShadow((new StringBuilder()).append("\247aHighjump (High)").toString(), 2, 24, 0xff0000);
        }else
        {
            fontrenderer.drawStringWithShadow((new StringBuilder()).append("\247aHighjump (Normal)").toString(), 2, 24, 0xff0000);
        }
        if(checkKey(Keyboard.KEY_K))
        {
            Ender.step = !Ender.step;
        }
        if(Ender.step)
        {
            EntityLiving.stepHeight = 8;
            fontrenderer.drawStringWithShadow((new StringBuilder()).append("\247aStep (8 Blocks)").toString(), 2, 36, 0xff0000);
        }else
        {
            EntityLiving.stepHeight = 1.0F;
            fontrenderer.drawStringWithShadow((new StringBuilder()).append("\247cStep (1.0 Blocks)").toString(), 2, 36, 0xff0000);
        }


-KeyStates
import org.lwjgl.input.Keyboard;

private boolean keyStates[];


 keyStates = new boolean [256];

public boolean checkKey(int i)
    {
        if(mc.currentScreen != null)
        {
            return false;
        }
        if(Keyboard.isKeyDown(i) != keyStates[i])
        {
            return keyStates[i] = !keyStates[i];
        }else
        {
            return false;
        }
    }