typedef void (* GenericFP)(int); //function pointer prototype to a function which takes an 'int' an returns 'void'

GenericFP MenuFP[3] = {&Page1, 
&Page2, &Page3}; //create an array of 'GenericFP' function pointers. Notice the '&' operator

void setup()
{
  Serial.begin(115200);
}

void loop()
{
  MenuFP[0](1); //call MenuFP element 0 with the parameter 1.  This is equivalent to: Page1(1)
  MenuFP[1](5); //call MenuFP element 1 with the parameter 5.  This is equivalent to: Page2(5)
  MenuFP[2](7); //and so on.                                   This is equivalent to: Page3(7)
}

void Page1(int foo)
{
  Serial.print("Page1=");
  Serial.println(foo);
}

void Page2(int foo)
{
  Serial.print("Page2=");
  Serial.println(foo);
}

void Page3(int foo)
{
  Serial.print("Page3=");
  Serial.println(foo);
}