1st JS Game - Number guessing

number_game.js

var target, guess_input, guess_input_text;
var finished = false;
var guesses = 0;

function guessing_game() {
		var random_number = Math.random() * 100;
		var random_number_integer = Math.floor(random_number);
		target = random_number_integer + 1;
		while (!finished) {
				guess_input_text = prompt("Guess what number I'm thinking of? ");
				guess_input = parseInt(guess_input_text);
				guesses = guesses + 1;
				finished = check_guess(guess_input);
		}
}

function check_guess() {
		if ((guess_input < 1) || (guess_input > 100)); {
			alert("You are close, keep guessing and you'll get there. Remember to keep the numbers within 1 to 100.")
			return false;
		} 
		else (guess_input == target); {	
			alert("Your number is correct! Congratulations")
			return true;
		}
		
}