I have been working on a "Rock Paper Scissors" game to see if I understand the basics of JavaScript. It all works well until I get to the if statement from lines 30 to 71 in the `fight()`: I have adjusted the reply variable to indicate how it may be "if'ing" through. It seems to be returning the default value of every sub "if" in the overall "if". Am I using the wrong variable for the secondary condition maybe?

Code HTML4Strict:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html lang="EN" dir="ltr" xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="content-type" content="text/xml; charset=utf-8" />
    <title>radioGroup.html</title>
    <link rel = "stylesheet"
          type = "text/css"
          href = "radioGroup.css" />
 
    <script type = "text/javascript">
      //<![CDATA[
      // from radioGroup.html
      function fight(){
	  	var randomChoice = Math.random();
		var threeChoice = Math.floor (randomChoice * 3);
		var weapon = document.getElementsByName("weapon");
 
        for (i = 0; i < weapon.length; i++){
          currentWeapon = weapon[i];
 
          if (currentWeapon.checked){
            var selectedWeapon = currentWeapon.value;
          } // end if
 
        } // end for
 
		var cpuChoice = new Array("Paper", "Rock", "Scissors")
        var reply = "xxx"
		if (threeChoice === 0) {
			if (weapon === "Paper") {
				reply = "11";
				}
			else if (weapon === "Rock") {
					reply = "12";
				}
			else if (weapon === "Scissors") {
					reply = "13";
					}
			else {
					reply = "what1";
					}
		}else if (threeChoice === 1) {
				if (weapon === "Paper") {
				reply = "21";
				}
			else if (weapon === "Rock") {
					reply = "22";
				}
			else if (weapon === "Scissors") {
					reply = "23";
					}
			else {
					reply = "what2";
					}
		}else if (threeChoice === 2) {
				if (weapon === "Paper") {
				reply = "31";
				}
			else if (weapon === "Rock") {
					reply = "32";
				}
			else if (weapon === "Scissors") {
					reply = "33";
					}
			else {
					reply = "what3";
					}
		}else {
			reply = "hay now?";
			}
		var output = document.getElementById("output");
        var response = "<h2>You have chosen ";
        response += selectedWeapon + "<h2>The CPU has chosen ";
		"<\/h2> \n";
		response += cpuChoice[threeChoice] + "<\/h2> \n";
		response += reply + "<\/h2> \n";
        output.innerHTML = response;
     } // end function
 
      //]]>
    </script>
  </head>
 
  <body>
    <h1>Choose!</h1>
    <form action = "">
      <fieldset>
        <input type = "radio"
               name = "weapon"
               id = "radPaper"
               value = "Paper"
               checked = "checked" />
        <label for = "radPaper">Paper</label>
 
        <input type = "radio"
               name = "weapon"
               id = "radRock"
               value = "Rock" />
        <label for = "radRock">Rock</label>
 
        <input type = "radio"
               name = "weapon"
               id = "radScissors"
               value = "Scissors" />
        <label for = "radScissors">Scissors</label>
        <button type = "button"
                onclick = "fight()">
          fight the dragon
        </button>
      </fieldset>
    </form>
    <div id = "output">
 
    </div>
  </body>
</html>