H Bridge Direction button

hello have simple h-bridge set (attached) , here code have far.

int enablepin = 11;
int in1pin = 10;
int in2pin = 9;
int switchpin = 7;
int potpin = 0;

void setup()
{
  pinmode(in1pin, output);
  pinmode(in2pin, output);
  pinmode(enablepin, output);
  pinmode(switchpin, input_pullup);
}

void loop()
{
  int speed = analogread(potpin) / 4;
  boolean reverse = digitalread(switchpin);
  setmotor(speed, reverse);
}

void setmotor(int speed, boolean reverse)
{
  analogwrite(enablepin, speed);
  digitalwrite(in1pin, ! reverse);
  digitalwrite(in2pin, reverse);
}


im using reed switch push button changes direction when being held down. how can make switch direction permanently until pushed again?

code: [select]

boolean reverse, laststate; // set global, @ top of code
.
.
.
//inside loop function
if(digitalread(switchpin) == low && digitalread(switchpin) != laststate) // looking see if button state low , not equal last state.
{
  reverse = !reverse; // change when button state low
}

laststate = digitalread(switchpin);
had make slight edit.

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