[MINOR] Block not spreading up.

I'm having a minor problem I can't solve and I've got no matches on google so far.

I'm having a block that spreads, consisting out of this code in my Block.class:

  public void updateTick(World par1World, int par2, int par3, int par4, Random par5Random)
    {
            if (par1World.getBlockLightValue(par2, par3 + 1, par4) < 4 && Block.lightOpacity[par1World.getBlockId(par2, par3 + 1, par4)] > 2)
            {
                par1World.setBlockWithNotify(par2, par3, par4, Mod.ModBlock..blockID);
            }
            else if (par1World.getBlockLightValue(par2, par3 + 1, par4) >= 1)
            {
                for (int var6 = 0; var6 < 46; ++var6)
                {
                    int var7 = par2 + par5Random.nextInt(10) - 1;
                    int var8 = par3 + par5Random.nextInt(10) - 3;
                    int var9 = par4 + par5Random.nextInt(10) - 1;
                    int var10 = par1World.getBlockId(var7, var8 + 1, var9);

                    if (par1World.getBlockId(var7, var8, var9) == Mod.ModBlock.blockID)
                    {
                        par1World.setBlockWithNotify(var7, var8, var9,mod_Mod.ModBlock.blockID);
                    }  
                    else if (par1World.getBlockId(var7, var8, var9) == Mod.ModBlock.blockID)
                    {
                        par1World.setBlockWithNotify(var7, var8, var9,mod_Mod.ModBlock.blockID);
                    }  
                }
            }
        }
    }

Its spreads all the ways except up, wich is what I need.

Is there a possible way of doing this?