Cant Decrement Clock!??

I've been messing around with this program for quite a while now and have run out of ideas. Im can t get the clock to increment when enable -which is assigned to a switch- is high, but I am not able to get the clock to decrement when enable is low. Any help or insight is appreciated.

Thanks.

Signal counter, counter2 : INTEGER;

PROCESS(enable, clock_50)

--VARIABLE counter: INTEGER;

BEGIN

IF(clock_50 = '1' AND clock_50'EVENT) then

IF(enable = '1') THEN

IF (counter = 52428800/15) THEN --Speed of the on board clk (50Mhz)

counter <= 0;

toggle_clk <= NOT toggle_clk;

ELSE

counter <= counter + 1;

counter2 <= counter2 + 1;

END IF;

ELSE

counter <= 0;

toggle_clk <= '0';

END IF;

END IF;

END PROCESS;

--Decelarate

PROCESS(enable, clock_50)

--VARIABLE counter2: INTEGER;

BEGIN

counter2 <= counter;

toggle_clk2 <= toggle_clk;

IF(clock_50 = '1' AND clock_50'EVENT) then

IF(enable = '0') THEN

IF (counter2 = 52428800/22) THEN --Speed of the on board clk (50Mhz)

counter2 <= 0;

toggle_clk2 <= not toggle_clk2;

ELSE

counter2 <= counter2 - 1;

--counter <= counter -1;

END IF;

ELSE

counter2 <= 0;

toggle_clk2 <= '0';

END IF;

END IF;

END PROCESS;