guess my number s-found JS

//main -- screenshot http://i.imgur.com/hmJVfLJ.png

var value;
var magic_number;
var number_of_tries;

function math_random_int(a, b) {
  if (a > b) {
    // Swap a and b to ensure a is smaller.
    var c = a;
    a = b;
    b = c;
  }
  return Math.floor(Math.random() * (b - a + 1) + a);
}

function guess(value) {
  number_of_tries = number_of_tries + 1;
  if (number_of_tries == 10) {
    if(evalRun){echo((String('10 tries! you lose! the numer was:') + String(magic_number)));}
  } else {
    if (value < magic_number) {
      if(evalRun){echo('Too low.');}
      if(evalRun){input_trigger_label('entry','what if your guess?:',ON_INPUT)};
    }
    if (value > magic_number) {
      if(evalRun){echo('Too high.');}
      if(evalRun){input_trigger_label('entry','what if your guess?:',ON_INPUT)};
    }
    if (value == magic_number) {
      if(evalRun){echo('you got it!');}
    }
  }
}


function ON_STARTUP(){
  magic_number = math_random_int(1, 100);
  number_of_tries = 0;
  if(evalRun){echo('computer: I have chosen a number from 1 to 100, you have 10 tries');}
  if(evalRun){input_trigger_label('entry','what if your guess?:',ON_INPUT)};

}
function ON_INPUT(){
  if ((label) == 'entry') {
    guess((user_answer));
  }

}