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;
}

}


}