if (document.getElementById && document.createTextNode) {	

  /* Maximum number */
  var m_num = 10;  	
  /* Number of guesses the viewer has */
  var num_chances = 3; 
  /* Message displayed after a correct guess */
  var you_win = "Correct! You Win!"; 
  /* Message displayed after after all guesses have been used */
  var you_lose = "Sorry! You lose!";
  /* Message displayed if user guesses too low */  
  var need_higher = "I\'m looking for a higher number."; 
  /* Message displayed if user guesses too high */
  var need_lower = "I\'m looking for a lower number."; 
  
  
  
  var c = 1;
  var ran_num = Math.floor(Math.random()*(m_num));
  ran_num += 1;
  
  function num_reset() {
	c = 1;
	ran_num = Math.floor(Math.random()*(m_num));
	ran_num += 1;
  }

  function guess_num() {

 
	var user_guess = document.getElementById("Guess").value;
    user_guess *= 1;
	
	var to_match = /\d+/;
	var is_num = to_match.test(user_guess);
	
	if (!is_num) {
	  window.alert("Guesses must be numeric.");	
	  return false;
	}
	
	if ( (user_guess < 1) || (user_guess > m_num) ) {
	  window.alert("Guesses must be between 1 and "+m_num+".");
	  return false;
	}
	
	if (c<=num_chances) {
		
		var chances_left = num_chances-c;
		var sing_plural = "guesses"
		
		if (user_guess == ran_num) {
			window.alert(you_win);
			num_reset();
			return false;
		}
		else {
			
			if (c == num_chances) {
			window.alert(you_lose+"\n\nI was looking for the number "+ran_num+"!");	
			num_reset();
			return false;
		    }
		    else {
			  var which_way = (user_guess < ran_num) ? need_higher : need_lower;  	
			  if (chances_left == 1) {
				  sing_plural = "guess";
			  }
    	      window.alert(which_way+" You have "+chances_left+" "+sing_plural+" left!");
			  c+=1;
			  return false;
		    }
	   }
    }
	else {
	  return false;
	}
    
  }

 
}