JS Bin// source http://jsbin.com/vogile

jsbin.vogile.js

/****************************************************************
 * Rock, Paper, Scissors, Lizard, Spock, 
 * Spider-Man, Batman, Wizard, Glock
 ***************************************************************/

'// noprotect';

function numberToName(number, choices){
    return choices[number];
}

function nameToNumber(name, choices){
    return choices.indexOf(name);
}

function gameResult(player1, player2, resultsArr){
	if(player1==player2) return "Tie game.";
	for(var i=0; i<resultsArr.length; i++){
		
		if(resultsArr[i].indexOf(player1)>=0 && resultsArr[i].indexOf(player2)>=0){
			return resultsArr[i];
		}
	}
	return ("An error occured. No matching result.");
}


function rpsls(name){
    compNumber = Math.floor(Math.random() * 9);
    playerNumber = nameToNumber(name, choices);
    difference = (playerNumber - compNumber);
    differenceModular = (difference + 9)  % 9;

    // console.log("differenceModular: "+differenceModular);
	  
    // console.log( "Player chooses " + name);
    compName = numberToName(compNumber, choices);
    console.log( "You chose: "+name + " and Computer chooses: "+compName);
	  
	  var result = gameResult(name, compName, results);
	  
    
    if (0 < differenceModular && differenceModular <= 4){
        result += " Player wins!";			
		}

    else if (4 < differenceModular){
        result += " Computer wins!";			
		}

    return result;
} 

var player,
// 	The order or choices in the array matters!
		choices = ["Rock",        // 0
							 "Spock",       // 1
							 "Batman",      // 2
							 "Glock",       // 3
							 "Paper",       // 4
							 "Lizard",      // 5
							 "Wizard",      // 6
							 "Spider-Man",  // 7
							 "Scissors"],   // 8
	  results = [
			"Spock vaporizes Rock.",                                         // 0 (0,1)
			"Batman explodes Rock.",                                         // 1 (0,2)
			"Glock breaks Rock.",                                            // 2 (0,3)
			"Paper covers Rock.",                                            // 3 (0,4)
			"Rock crushes Lizard.",                                          // 4 (0,5)
			"Rock interrupts Wizard.",                                       // 5 (0,6)
			"Rock knocks out Spider-Man.",                                   // 6 (0,7)
			"Rock crushes Scissors.",                                        // 7 (0,8)
			"Batman hangs Spock.",                                           // 8 (1,2)
			"Glock shoots Spock.",                                           // 9 (1,3)
			"Paper disproves Spock.",                                        // 10 (1,4)
			"Lizard poisons Spock.",                                         // 11 (1,5)
			"Spock zaps Wizard.",                                            // 12 (1,6)
			"Spock befuddles Spider-Man.",                                   // 13 (1,7)
			"Spock smashes Scissors.",                                       // 14 (1,8)
			"Glock kills Batman's mom.",                                     // 15 (2,3)
			"Paper delays Batman.",                                          // 16 (2,4)
			"Lizard confuses Batman (because he looks like Killer Croc).",   // 17 (2,5)
			"Wizard stuns Batman.",                                          // 18 (2,6)
			"Batman scares Spider-Man.",                                     // 19 (2,7)
			"Batman dismantles Scissors.",                                   // 20 (2,8)
			"Paper jams Glock.",                                             // 21 (3,4)
			"Lizard is too small for Glock.",                                // 22 (3,5)
			"Wizard melts Glock.",                                           // 23 (3,6)
			"Spider-Man disarms Glock.",                                     // 24 (3,7)
			"Glock dents Scissors.",                                         // 25 (3,8)
			"Lizard eats Paper.",                                            // 26 (4,5)
			"Wizard burns Paper.",                                           // 27 (4,6)
			"Spider-Man rips Paper.",                                        // 28 (4,7)
			"Scissors cuts Paper.",                                          // 29 (4,8)
			"Wizard transforms Lizard.",                                     // 30 (5,6)
			"Spider-Man defeats Lizard.",                                    // 31 (5,7)
			"Scissors decapitates Lizard.",                                  // 32 (5,8)
			"Spider-Man annoys Wizard.",                                     // 33 (6,7)
			"Scissors cut Wizard.",                                          // 34 (6,8)
			"Scissors cut Spider-Man.",                                      // 35 (7,8)
		];

while((player = prompt("Choose 'Rock', 'Paper', 'Scissors', 'Lizard', 'Spock', 'Spider-Man', 'Batman', 'Wizard' or 'Glock'.")) && choices.indexOf(player) < 0 ){

	alert("I said, choose 'Rock', 'Paper', 'Scissors', 'Lizard', 'Spock', 'Spider-Man', 'Batman', 'Wizard' or 'Glock'.");
}

if(!player){ console.log("Bye!"); }else{
    console.log(rpsls(player, choices, results) );
}

// TESTS
// console.log(numberToName(8,choices)); console.log(nameToNumber("Rock",choices));
// console.log(numberToName(7,choices)); console.log(nameToNumber("Spock",choices));
// console.log(numberToName(6,choices)); console.log(nameToNumber("Paper",choices));
// console.log(numberToName(5,choices)); console.log(nameToNumber("Lizard",choices));
// console.log(numberToName(4,choices)); console.log(nameToNumber("Scissors",choices));
// console.log(numberToName(3,choices)); console.log(nameToNumber("Spider-Man",choices));
// console.log(numberToName(2,choices)); console.log(nameToNumber("Batman",choices));
// console.log(numberToName(1,choices)); console.log(nameToNumber("Wizard",choices));
// console.log(numberToName(0,choices)); console.log(nameToNumber("Glock",choices));
// console.log(gameResult('Rock','Rock',results));
// console.log(gameResult('Rock','Paper',results));
// console.log(gameResult('Rock','Glock',results));
// console.log(gameResult('Rock','Wizard',results));
// console.log(gameResult('Rock','Batman',results));

// console.log(rpsls("Rock") );
// console.log(rpsls("Spock") );
// console.log(rpsls("Paper") );
// console.log(rpsls("Lizard") );
// console.log(rpsls("Scissors") );
// console.log(rpsls("Spider-Man") );
// console.log(rpsls("Batman") );
// console.log(rpsls("Wizard") );
// console.log(rpsls("Glock") );

//image: http://www.sheldonsquote.com/medias/435/458.jpg